[tex]\displaystyle 6 \ mol \ N_2[/tex]
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Using Dimensional AnalysisReactions RxNExplanation:Step 1: Define
[RxN - Balanced] N₂ + 3H₂ → 2NH₃
[Given] 12 mol NH₃
[Solve] x mol N₂
Step 2: Identify Conversions
[RxN] 1 mol N₂ → 2 mol NH₃
Step 3: Stoich
[DA] Set up: [tex]\displaystyle 12 \ mol \ NH_3(\frac{1 \ mol \ N_2}{2 \ mol \ NH_3})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 6 \ mol \ N_2[/tex]Answer:
[tex]\boxed {\boxed {\sf 6 \ moles \ of \ N_2}}[/tex]
Explanation:
1. Balance Equation
We are given the reaction:
[tex]1 N_2+3H_2 \rightarrow 2 NH_3[/tex]
The equation is already balanced. Both sides have 2 moles of nitrogen and 6 moles of hydrogen.
2. Conversions
In this reaction, 1 mole of nitrogen produces 2 moles of nitrogen tryhdride:
[tex]1 \ mol \ N_2 \rightarrow 2 \ mol \ NH_3[/tex]
3. Stoichiometry Calculations
Use the conversion rate as a fraction.
[tex]\frac{ 1 \ mol \ N_2}{2 \ mol \ NH_3}[/tex]
Multiply the number of moles of nitrogen trihydride produced: 12 moles.
[tex]12 \ mol \ NH_3 *\frac{ 1 \ mol \ N_2}{2 \ mol \ NH_3}[/tex]
The moles of nitrogen trihydride cancel.
[tex]12 *\frac{ 1 \ mol \ N_2}{2} = \frac{ 12 \ mol \ N_2}{2}[/tex]
[tex]6 \ mol \ N_2[/tex]
6 moles of nitrogen are needed to produce 12 moles of nitrogen trihydride.
Calculate the binding energy per nucleon for 3He and 4He. MeV/nucleon (for 3He) = MeV/nucleon (for 4He) = Which nucleus is more tightly bound?
Nuclear binding energy is defined as the minimum amount of energy required to disassemble or break down an atom's nucleus into the subatomic particles that make it up (which are protons and neutrons).
Define binding energy per nucleon?Protons and neutrons, a pair of subatomic particles found in the nucleus, are collectively referred to as nucleons.The difference between nuclear attraction and the disruptive energy of the electric force constitutes the net binding energy associated with a certain nucleus.
It is important to note that as the number of nucleons in the nucleus increases, so does the net binding energy per nucleon.As a result, the atomic number is inversely proportional to the net binding energy per nucleon. Using the formula BE=(m)c2, where m is the mass defect, get the total binding energy (BE).
BE divided by A yields the binding energy per nucleon (BEN) (Equation 10.3. 3). BE=[2mp+2mn]−m(4He)c2. Say, for instance, that we have a nucleus of mass MA and Z protons, N neutrons, and A.
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Balance each redox reaction in basic solution using the half reaction method. O2 + Cr3+ → H2O2 + Cr2O7^2-
The final balanced redox reaction in the basic solution is:
O2 + 2H2O + Cr3+ → H2O2 + Cr2O7^2- + 4OH-
What is a redox reaction?Generally, The half-reaction method involves breaking the overall redox reaction into two half-reactions: oxidation and reduction. The oxidation half-reaction is:
Cr3+ → Cr2O7^2- + 3e-
The reduction half-reaction is:
O2 + 2H2O + 4e- → 4OH-
To balance the electrons in the oxidation half-reaction, we need to add 3 electrons on the right side. To balance the electrons in the reduction half-reaction, we need to add 4 electrons on the left side.
When we combine the two half-reactions, we get:
O2 + 2H2O + Cr3+ → H2O2 + Cr2O7^2- + 3e-
We then add 4OH- on the right side to neutralize the electrons on the left side, giving us:
O2 + 2H2O + Cr3+ → H2O2 + Cr2O7^2- + 3e- + 4OH-
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How does the pH at the equivalence point change as the acid being titrated becomes weaker? How does the volume of NaOH( aq ) needed to reach the equivalence point change?
As the acid weakens, the pH at the equivalence point rises (becomes more basic). The amount of extra base required to achieve the equivalence point grows.
What is titration?Titration is a standard quantitative chemical analysis laboratory method for determining the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution of known concentration and volume. A titration is a procedure that uses a known solution to determine the concentration of an unknown solution. Typically, until the reaction is complete, the titrant (the known solution) is added from a buret to a known quantity of the analyte (the unknown solution). A titration is described as 'the process of calculating the quantity of a material A by adding calibrated increments of substance B, the titrant, with which it interacts until precise chemical equivalency (the equivalence point) is obtained'.
Here,
The pH at the equivalency point rises as the acid diminishes (becomes more basic). The quantity of additional base needed to reach the equivalence point increases.
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Provide a synthesis of 2-ethylhexanol using butanal as the only source of carbon.
Synthesis of 2-ethylhexanol: Butanol is then reacted with formaldehyde and a strong base such as sodium hydroxide to form 2-ethylhexanol.
Describe how the reaction works?One possible synthesis of 2-ethylhexanol using butanal as the only source of carbon is:
Synthesis of Butyl Butyrate: Butanal is reacted with butanol in the presence of an acid catalyst to form butyl butyrate.Ester hydrolysis: Butyl butyrate is then hydrolyzed using aqueous acid to form butanoic acid and butanol.Synthesis of 2-ethylhexanol: Butanol is then reacted with formaldehyde and a strong base such as sodium hydroxide to form 2-ethylhexanol.The overall reaction can be described as:
Butanal + Butanol (in presence of acid catalyst) -> Butyl Butyrate
Butyl Butyrate + H2O (in presence of aqueous acid)-> Butanoic acid + Butanol
Butanol + Formaldehyde + NaOH -> 2-ethylhexanol
It's important to notice that this is only one possible synthesis and there are different methods to obtain 2-ethylhexanol, this is also a multi-step process and each step should be optimized for yield and purity.
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Predict the number of signals and their multiplicity in the 1H-NMR spectra of the following compounds.
(i) ClCH2CH2CH2Cl (ii) ii)CH3CH2COOCH(CH3)2
I ClCH2CH2CH2Cl (c)
Such a demonstration is possible. ClーCH2ーCH2ーCH2ーClThe structural formula of the supplied compound's carbon atoms is marked as C-1, C-2, and C-3 on the left side.The carbon atom C-2 is seen to have a plane of symmetry there.The hydrogen (H) atoms connected to C-1 and C-3 are hence equivalent. Additionally, the hydrogen (H) atom connected to the C-2 carbon atom has a distinct chemical environment than the C-1 and C-3 carbon atoms.Thereby,
In the specified compound, there are three equivalent sets of protons. In the 1H-NMR spectrum, three signals have been identified.The (n+1) rule, where n is the number of hydrogen atoms bonded to a neighbouring carbon atom, is used to calculate the multiplicity of the three signals as follows:
1. There are n+1 H atoms connected to the C-1 carbon atom.Here, n =2 (because the nearby carbon (C-2) atom contains two H-atoms)So, (2+1) = 3 (signal shows as a triplet) (signal appears as a triplet)Similarly,2. H is bonded to carbon atom C-2 in multiples of (4+1) = 5. (appears as a quintet)3. The H atoms linked to the C-3 carbon atom have a multiplicity of (2+1) = 3. (appears as a triplet)CH3CH2COOCH(CH3)2
It may appear as:
CH3ーCH2ーCOーOーCHー(CH3)2
On the right side of the structural formula, the two -CH3 groups connected to the -CH group are in the same chemical environment. This makes the hydrogen (H) atoms in the two (-CH3) groups equal. 6 protons will thus produce a single signal in 1H-NMR.In the 1H-NMR spectrum, the H atom in the -CH group (carbon atom single bonded to the O atom) on the right side of the structural formula produces one signal.On the left side of the structural formula, the 2 H atoms in the -CH2 group joined to the C=O group produce 1 signal in the 1H-NMR spectrum.The given compound contains a total of 4 equivalent protons. Consequently, the 1H-NMR spectrum shows 4 signals.
The (n+1) rule, as given in the above part I is once more used to calculate the multiplicity of the four signals.
1. The number of 6 H molecules in the two CH3 groups is equal to n+1.
n= 1 (just 1 H is present on the next carbon that is, -CH group) (only 1 H is present on the adjacent carbon that is, -CH group)In other words, the multiplicity of 6 H = 1+1 = 2 (signal appears as a doublet)Similarly,2. 1H on the CH group has a multiplicity of 6+1 = 7. (signal appears as a septet)3. 2H's multiplicity on the CH2 group equals 3+1 = 4. (A quartet represents signal.)The multiplicity of 3H on the CH3 group = 2+1 =3 (signal appears as a triplet)To learn more about compound refer to:
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draw the alcohol you would use to produce each of the following ketones: draw all hydrogen atoms.
A. 3-pentanone
B. 2-pentanone
C. 3-hexanone
Atoms one of the following ketones, all of which contain hydrogen atoms (C5H10), would be created using alcohol.
What is hydrogen, H2 or H?The chemical formula of hydrogen is H2, and it has an molar mass of 1. The atomic number one of the lightest element is hydrogen, abbreviated H. It is a gas at room pressure and temperature that has the functional group H2 hydrogen chloride (HCl), which is a combination of elements hydrogen and chlorine. It is also tasteless, odorless, and highly combustible. Hydrochloric acid is the name given to a gaseous solution in water.
Why H2 rather than H?As a result, when two hydrogen atoms bind, they share electrons. The term for this is covalent bonding. In your forthcoming classes, you will receive a detailed introduction to it. Consequently, hydrogen is H2 rather than H.
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A phosphorus compound that contains 34.00% phosphorus by mass has the formula X3 P2
The equation for the phosphorus by mass of the compound with the chemical formula of X3P2 is:%Phosphorus=2×(MolarMassofPhosphorus)/MolarMassofthecompound×100.
A phosphorus compound?Given in this issue is a phosphorus compound with a mass percentage of 34.0 percent phosphorus and the formula x, 3 p 2. Now that x must be identified, the formula is x, 3, p, 2.
There are two phosphorus atoms present, and their combined mass will be 31.0 grammes per mole. That equates to 62.0 g/mol. Given in this issue is a phosphorus compound with a mass percentage of 34.0 percent phosphorus and the formula x, 3 p 2.
Now that x must be identified, the formula is x, 3, p, 2. There are two phosphorus atoms present, and their combined mass will be 31.0 grammes per mole. That equates to 62.0 g/mol.
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Calculate the pH of a solution prepared by dissolving 0.21 mol of acetic acid and 0.43 mol sodium acetate in water and adjusting the volume to 500 mL
The pH of the solution is 5.07.
What is the pH?We know that when we mix the sodium acetate with a solution of acetic acid what we are going to have is a buffer. We know that the buffer is the kind of solution that we are able to get from a weak acid and its salt just as acetic acid and sodium acetate.
We know that;
Molarity of the salt = 0.43/0.5 L = 0.86 M
Molarity of the acid = 0.21/0.5 L = 0.42 M
Hence;
pH = pKa + log(salt/acid)
pH = 4.76 + log(0.86/0.42)
pH = 5.07
We would have a pH of 5.07
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Look at the diagram.
Which two structures are first to combine in translation?
1 and 4
2 and 3
3 and 4
1 and 2
The two structures are first to combine in translation are 3 and 4. Therefore, option C is correct.
What is translation ?The process in which the information encoded in the mRNA is used to direct the sequencing of amino acids, and therefore it finally synthesizes a protein is called as translation.
In translation the information passed from DNA to mRNA and turns it into a series of amino acids bound together with peptide bonds.
Translation is translation from one code of nucleotide sequence to another code of amino acid sequence.The two structures are first to combine in translation are 3 and 4.
Thus, option C is correct.
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What Volume of 25% (w/v) solution HNO3?
To find the volume of 25% (w/v) solution HNO3, you need to know the mass of HNO3 and the total volume of the solution.
What do you mean by volume?
Volume is a measure of the amount of space taken up by a three-dimensional object or substance. It is commonly used to measure the amount of a liquid, gas, or solid. In chemistry, volume is usually expressed in units such as liters (L), milliliters (mL), cubic centimeters (cm3), or milligrams (mg).
For example, if the total volume of the solution is 100 mL and the mass of HNO3 is 25 g, then the volume of 25% (w/v) solution HNO3 is 25 mL.
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Predict the product formed when calcium, Ca, combines with arsenic, As? (Please explain why) a. Ca3As2 b. Ca2As3 c. CaAs d. Ca2As2 e. Ca3As3
The chemical element calcium has the atomic number 20 and the letter Ca as its symbol. Calcium is an alkaline earth metal that reacts with air to create a black oxide-nitride coating.
What happens when calcium reacts with?With the chemical symbol Ca and atomic number 20, calcium is a member of the calcium family. Calcium is a reactive metal and an alkaline earth metal that, when exposed to air, develops a shady oxide-nitride layer.
In this article, the arsenic acid formula—also known as orthoarsenic acid formula or as arsoric acid formula—is explored. Three hydroxyl and one oxo group make up this arsenic oxoacid.
Arsenopyrite is the mineral with the greatest prevalence of arsenic. Realgar, orpiment, and enargite are some more minerals. Most arsenic is created as a byproduct of the copper and lead refining process.
Metal calcium and water interaction - Less vehemence is produced when calcium metal combines with water.
Therefore, the correct answer is option e) Ca3As2.
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Which of the following is (are) formed in the reaction between ethyl butanoate and ethyl amine?
Select one:
O a. ethanol O b. 1-butanol O c. N-ethylbutanamide O d. both A and C O e, both B and C
Both B and C reaction between ethyl butanoate and ethyl amine.
What is amines?Amines are organic compounds derived from ammonia by replacing one, two, or all three hydrogen atoms with alkyl or aryl groups. They are classified as primary, secondary, and tertiary amines depending on the number of carbon atoms connected to the nitrogen atom. Amines have a strong smell, and many of them are used in the production of pharmaceuticals, dyes, and other products. Amines are also important intermediates in the synthesis of many organic compounds.
In the reaction between ethyl butanoate and ethyl amine, both 1-butanol and N-ethylbutanamide are formed. Ethyl butanoate is an ester, which consists of an alcohol and an acid joined together. When ethyl amine is added, the ester breaks apart, releasing the acid and alcohol components. The acid component is then protonated by the amine, forming N-ethylbutanamide. The alcohol component, which is 1-butanol, is also released in the reaction.
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Which of these changes is an example of a physical change?
A. electrolysis of water forming hydrogen and oxygen
B. cooking an egg
C. melting ice
D. iron combining with oxygen to form rust
Answer: C. Melting Ice
Explanation: The rest are chemical changes, the ice is the same substance (water), just changing physical forms, solid --> liquid
How do the Z, N, and A values compare for each pair of atoms?
(a) ^3_1 H and ^3_2 He (b) ^14_6 C and ^15_7 N
(c) ^19_9 F and ^18_9 F
The Z value is the atomic number of an atom, which is the number of protons in the nucleus of an atom.
What is nucleus?The nucleolus is a specialized structure located in the nucleus of a eukaryotic cell. It is composed of proteins and RNA molecules, and is responsible for the production, assembly, and transport of ribosomes. The nucleolus is the site of transcription, processing, and assembly of ribosomal RNA (rRNA) precursors into the ribosomal subunits that make up the ribosome. The ribosome is the cell's protein-synthesizing machinery, and the nucleolus is essential for its production. The ribosomes are then released into the cytoplasm, where they can translate mRNA into proteins.
The N value is the number of neutrons in the nucleus of an atom, and A is the mass number, which is the sum of the number of protons and neutrons in the nucleus of an atom.
For the first pair of atoms, ^3_1 H and ^3_2 He, the Z value for both is 3, since both have 3 protons in their nucleus. However, the N value for ^3_1 H is 1 and the N value for ^3_2 He is 2. Therefore, ^3_2 He has one more neutron in its nucleus than ^3_1 H. Lastly, the A value for ^3_1 H is 1 and the A value for ^3_2 He is 4. Therefore, the mass number of ^3_2 He is 3 times higher than ^3_1 H.
For the second pair of atoms, ^14_6 C and ^15_7 N, the Z value for both is 6, since both have 6 protons in their nucleus. The N value for ^14_6 C is 8 and the N value for ^15_7 N is 7. Therefore, ^15_7 N has one less neutron in its nucleus than ^14_6 C. Lastly, the A value for ^14_6 C is 14 and the A value for ^15_7 N is 15. Therefore, the mass number of ^15_7 N is 1 higher than ^14_6 C.
For the third pair of atoms, ^19_9 F and ^18_9 F, the Z value for both is 9, since both have 9 protons in their nucleus. The N value for ^19_9 F is 10 and the N value for ^18_9 F is 9. Therefore, ^18_9 F has one less neutron in its nucleus than ^19_9 F. Lastly, the A value for ^19_9 F is 19 and the A value for ^18_9 F is 18. Therefore, the mass number of ^18_9 F is 1 lower than ^19_9 F.
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How many atoms are in 17.1 grams of LiCl?
17.1 grams of LiCl is equal to 0.6 moles of LiCl.
What is ionic compound?An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. It is a type of chemical bond that generates two oppositely charged ions, typically a cation (positive ion) and an anion (negative ion). In other words, ionic compounds are formed when a metal and a non-metal react to form a salt. Examples of ionic compounds include table salt (NaCl), baking soda (NaHCO3), and calcium chloride (CaCl2).
Since LiCl is an ionic compound, it is composed of both Li+ and Cl- ions. Each mole of LiCl contains 6.023 x 1023 formula units, which is the same as 6.023 x 1023 atoms. Therefore, 17.1 grams of LiCl contains 3.61 x 1024 atoms of Li+ and 3.61 x 1024 atoms of Cl-.
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Calculate the frequency of the red light emitted by a neon sign with a wavelength of 659.9nm
The red light emitted by a neon sign has a frequency of 4.5410^11 Hz.
What is frequency?Frequency is the number of waves which passes through a fixed point at a certain time.
Here,
The frequency of the red light emitted by a neon sign is 4.54×10¹¹ Hz
Given neon sign with a wavelength of 659.9nm
frequency of the red light is to be calculated
Wavelength and frequency are related to each other by Wavelength=Speed/frequency
speed of light is 3×10⁸ m/s
Wavelength=659.9nm that is equal to 6.599 ×10⁻⁷m
Frequency =3×10⁸ m/s÷6.599 ×10⁻⁷m
Frequency =4.54×10¹¹ Hz
The frequency of the red light emitted by a neon sign is 4.54×10¹¹ Hz.
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If a scientist was attempting to decide what type of light was best for reducing migraines, what is a dependent variable that would be tested? Number of migraines recorded in the study The different types of light used in the study Randomization of people used in the study The number of light bulbs used in the study
The dependent variable in this experiment is the number of migraines recorded in the study (option A).
What is dependent variable?Dependent variable in an experiment is the outcome measured to see the effectiveness of the treatment.
In an experiment, the independent variable is altered or changed to bring about a response in the dependent variable.
According to this question, if a scientist was attempting to decide what type of light was best for reducing migraines, the number of migraines recorded is the dependent variable.
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Which of the following Nitrogen Oxides have the same empirical formula? a)N2O5 b)NO c)N2O d)N2O4 e)NO2
N2O5 Nitrogen Oxide have the same empirical formula. The simplest whole number ratio of atoms present in a substance is its empirical formula in chemistry.
What is empirical formula?The simplest whole number ratio of atoms present in a substance is its empirical formula in chemistry. The empirical formula of sulphur monoxide, abbreviated SO, and disulfur dioxide, abbreviated S2O2, are two straightforward examples of this idea. The empirical formula is the most straightforward formula for a compound and is defined as the ratio of subscripts of the smallest whole number of the formula's constituent elements. It is referred to as the simplest formula as well. We can determine the relative atomic ratios in a compound using an empirical formula. The ratios also hold true at the molar level.The empirical formula is typically applied to simply display the atoms that make up a molecule. This is helpful if you want to quickly identify the elements you're working with. When determining the number of atoms in a chemical, the molecular formula is most helpful.
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The graphs below all refer to the same reaction. What is the order of this reaction?
o first order
o second order
o Unable to predict
o zeroth order
Zeroth order represents one of the choices that is correct for this reaction, according to the statement that is given.
What does the word "reaction" signify in chemistry?The conversion of one or more elements, known as reactant molecules, into one maybe more chemical drugs, known as products, is referred to as a reaction mechanism. Entities are composed of chemical elements or compounds.
What are the different types of reactions?Combustion, combination, decomposition, single-replacement, and double-replacement are the five fundamental categories of chemical reactions. You can categorize a reaction by looking at the reactants and the products of the reaction in question. More than single category will apply to some reactions.
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The complete question is-
The graphs below all refer to the same reaction. What is the order of this reaction?
first order
second order
Unable to predict
zeroth order
A sample of sodium oxide weighing 12.57 g contains 9.34 g of sodium. What is the empirical formula for this compound?
The empirical formula of a compound is NaO, and the approximate molar mass is 76 g.The answer then is Na2O2.
What is Empirical formula?An empirical formula is a compound's Chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms. This would be the compound's element with the lowest whole number ratio.
Steps to write Empirical formulaAssume a 100g sample of the substance so that the percentages can be translated into grams directly.To convert grams of any element to moles, use their molar masses.Divide the moles of each element by the mole that is the least from step 2 to arrive at a whole-number ratio.The empirical formula can be expressed with the moles as the subscript of each element if all the moles are whole numbers at this stage (or extremely near to it).There may be instances where one or more of the moles determined in step 3 are not whole numbers. Each mole should be multiplied by the least whole number that will make it a whole number.To know more about Empirical formula refer to:
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Which one of the following reactions would produce (S)-3-methoxyheptane in high yield? Entry field with correct answer
O sodium methoxide + (R)-3-bromoheptane
O sodium methoxide + (S)-3-bromoheptane
O sodium (R)-3-heptoxide + bromomethane
O sodium (S)-3-heptoxide + bromomethane
O Sodium methoxide + (S)-3-bromoheptane is the reactions would produce (S)-3-methoxyheptane in high yield.
Write about (S)-3-methylheptane.There are 26 atoms in the (S)-3-methylheptane molecule (s). Eight carbon atoms and 18 hydrogen atoms are present (s). Therefore, C8H18 can be used to represent the chemical formula of (S)-3-Methylheptane.
The molecular formula, as opposed to the empirical formula, which gives the numerical proportions of atoms of each kind, is the basis for the chemical formula of (S)-3-Methylheptane, which is based on the molecular formula and does not include structural information.
According to the rule of conservation of mass, a chemical reaction does not cause a change in the amount of any one of the elements included in a chemical formula. In light of the chemical formula, each side of the equation must therefore represent the same amount of any given element.
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Sodium is combined with bromine to produce sodium bromide. If you use 25.0 g of bromine, how many molecules is this?
25.0grams of bromine is equivalent to 1.881 × 10²³ molecules.
How to calculate number of molecules?The number of molecules of a substance can be calculated by multiplying the number of moles of the substance by Avogadro's number (6.02 × 10²³).
Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³. By definition, it is the number of elementary entities (atoms or molecules) comprising one mole of a given substance.
According to this question, sodium is combined with bromine to produce sodium bromide. If one uses 25.0g of bromine, the number of moles of bromine used is as follows:
no of moles = 25.0g ÷ 80g/mol
no of moles = 0.3125moles
no of molecules = 0.3125 × 6.02 × 10²³ = 1.881 × 10²³ molecules
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Circle the reactant that is a nucleophile and draw the mechanism using the appropriate arrows for the following reaction.
It is a tertiary alkyl halide that is being supplied. It will easily go through the SN1 replacement. The following steps will lead to the reaction(Attached).
A reactant known as a nucleophile provides an electron pair in order to create a covalent bond. Typically, a nucleophile has a negative charge or is neutral with one or two donatable electrons. Some examples include H2O, -OMe, or -OtBu. The species with a lot of electrons is a nucleophile overall.
A nucleophile typically has one electron pair and is negatively charged or neutral. Some examples include H2O, -OMe, or -OtBu. The species with a lot of electrons is a nucleophile overall. Generally speaking, electrophiles are positively charged or neutral organisms with vacant orbitals that are drawn to an electron-rich center.
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A 75 N force stretches a spring 175 cm. What was the proportionality constant?
Answer:
The proportionality constant of the spring is 0.42857 N/cm.
Explanation:
The proportionality constant (k) of a spring is given by the equation: force (F) = k * displacement (x)
k = F / x
Therefore, to find the proportionality constant of the spring, we can divide the force applied (75 N) by the displacement (175 cm)
k = 75 N / 175 cm
k = 0.42857 N/cm
The proportionality constant of the spring is 0.42857 N/cm.
Determine the average rate of change of B from t=0 s to t=402 s.
A ---> 2B
Time: Concentrations of A:
0 0.710
201 0.430
402 0.150
the average rate of change of B from t=0 s to t=402 s. A ---> 2B with
Time: Concentrations of A: 0 0.710, 201 0.430, 402 0.150 is 0.07%
To determine the average rate of change of B from t=0 s to t=402 s, we need to find the change in concentration of B (delta B) and divide it by the change in time (delta t). From t=0 s to t=201 s, the concentration of A changes from 0.710 to 0.430. Since the reaction is A ---> 2B, we can assume that the concentration of B doubles the concentration of A. So, the concentration of B changes from 0.710/2 = 0.355 to 0.430/2 = 0.215.The change in concentration of B is 0.215 - 0.355 = -0.140
From t=201 s to t=402 s, the concentration of A changes from 0.430 to 0.150. Using the same assumption, the concentration of B changes from 0.215 to 0.150/2 = 0.075. The change in concentration of B is 0.075 - 0.215 = -0.140 The total change in concentration of B is the sum of the two changes, which is -0.140 + (-0.140) = -0.280. The total change in time is 402s - 0s = 402sTherefore, the average rate of change of B is -0.280 / 402s = -0.000696, or -0.07% (two significant figures)
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Draw the three-dimensional representation for the R enantiomer of the molecule shown below.
The three-dimensional representation for the R enantiomer of the molecule shown below:
What is R enantiomer?An enantiomer is one of two stereoisomers that are not superposable onto their own mirror image in chemistry. It is also known as an optical isomer, antipode, or optical antipode. Enantiomers, like one's right and left hands, cannot be superposed on one other when staring at the same face. The chiral compound's enantiomers are named using the "right hand" and "left hand" nomenclature. The stereocenters are denoted by the letters R or S. Consider the first image: a curved arrow is drawn from the most important (1) substituent to the least important (4) substituent.
Here,
The following is a three-dimensional depiction of the molecule's R enantiomer:
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What is the mass of 3.25 moles of NaF
Which below best describe(s) the behavior of an amphoteric hydroxide in water?
a. With both conc. aq. NaOH and conc. aq. HCI, its suspension dissolves
b. With conc. aq. HCI, its suspension dissolves.
c. With conc. aq. NaOH, its suspension dissolves.
d. With conc. aq. HCI, its clear solution forms a precipitate.
e. With conc, aq. NaOH, its clear solution forms a precipitate.
b. With conc. aq. HCI, its suspension dissolves best describe(s) the behavior of an amphoteric hydroxide in water.
Amphoteric hydroxides are chemical compounds that can behave as both acids and bases. In the presence of an acid, such as hydrochloric acid (HCl), an amphoteric hydroxide will neutralize the acid and dissolve in water, forming a clear solution. In the presence of a base, such as sodium hydroxide (NaOH), an amphoteric hydroxide will react with the base and form a precipitate, which is visible as a solid that separates from the solution. So, option b. is the correct answer.
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Translate the sawhorse projection below into a wedge-and-dashed bond Cram projection.
The sawhorse projection of the molecule below can be translated into a wedge-and-dashed Cram projection by rotating the molecule 90 degrees so that the hydrogen atoms are on the left and the oxygen atom is on the right.
What is projection?Projection is a method of displaying data or information in a visual format, such as a graph, chart, map, or diagram. It is used to display relationships between two or more variables, such as a change in population over time. It can also be used to show the relationship between multiple variables, such as the correlation between unemployment and poverty. Projection is an important tool for data analysis and decision making, as it provides a visual representation of data that is easier to interpret than tables and equations.
Then, the bonds between the carbon and hydrogen atoms are represented by wedges, while the double bond between the carbon and oxygen atoms is represented by a dashed line. This results in the following Cram projection:
H3C-O-C-H2.
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Which of the following is true regarding the atoms involved in a chemical reaction? OPTIONS The same number of each type of atom will always be present before and after a chemical reaction takes place. Some of the atoms present before the reaction will always be lost during a chemical reaction. Some of the atoms will always be changed into a different type of atom by a chemical reaction. During a chemical reaction, atoms will always be combined into much larger molecules.
Answer:
The same number of each type of atom will always be present before and after a chemical reaction takes place.
Explanation:
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