Answer:
18.6 ( had to be 20 letter :/)
Explanation:
How many moles of zinc are there in 0.890 g of zinc?
Answer:
There are
4.517
⋅
10
23
atoms of Zn in 0.750 mols of Zn.
Explanation:
Since we know that there are
6.022
⋅
10
23
atoms in every mole of a substance (Avogadro's Number), there are
6.022
E
23
⋅
0.750
atoms of Zn in 0.750 mols of Zn.
Answer:
There are 4.517 ⋅ 10 23 atoms of Zn in 0.750 mols of Zn. have a good day:)
Explanation:
PLEASE HELP WILL GIVE BRAINLEIST ASAP Determine the fraction of an original sample of K-42 that remains unchanged after 24.72 hours.
Answer:
25% or 0.25 or 1/4
Explanation:
don't know which form you need so here you have all 3
good luck :)
BRAINLIEST!! IGNORE IF YOU DON'T KNOW Which compound contains the highest percentage of nitrogen by mass? Choose one and show your work.
NH4NH2CO2
NH4NO2
N2O3
NH4Cl
NH2OH
Answer:
NH4NO2.
Explanation:
Hello!
In this case, since the by-mass percent of any element (in this case nitrogen) is computed by:
[tex]\%N=\frac{n_N*m_N}{M}*100\%[/tex]
Whereas n is the number of N in the compound, m the atomic mass of nitrogen (14.01 g/mol) and M the molar mass of the compound. Thus, down below we can find the molar mass of each compound and the by-mass percent of nitrogen:
NH4NH2CO2 = 78.07 g/mol
[tex]\%N=\frac{2*14.01}{78.07}*100\%=35.9\%[/tex]
NH4NO2 = 64.06 g/mol
[tex]\%N=\frac{2*14.01}{64.06}*100\%=43.7\%[/tex]
N2O3 = 76.01 g/mol
[tex]\%N=\frac{2*14.01}{76.01}*100\%=36.9\%[/tex]
NH4Cl = 53.49 g/mol
[tex]\%N=\frac{1*14.01}{53.49}*100\%=26.2\%[/tex]
NH2OH = 33.03 g/mol
[tex]\%N=\frac{1*14.01}{33.03}*100\%=42.4\%[/tex]
In such a way, the compound with the highest percentage of nitrogen by mass is NH4NO2.
Best regards!
Answer:
NH4NO2
Explanation:
The answer is the 2ndone
NH4NO2
Why are K3[Cr(C2O4)3].3H2O, K2[Cu(C2O4)2].2H2O and K3[Fe(C2O4)3].3H2O coloured, whereas K3[Al(C2O4)3.3H2O is colourless?
Explanation:
If a body reflects only a/few color/s of the visible spectrum by absorbing remaining, it appears in that reflected color/s. In case of water, its tri-atomic (2 atoms of hydrogen and one atom of oxygen) structure does not absorb any colors from the visible spectrum of the light. ... Hence water appears colorless while others do absorb
Due to presence of paired electron in K3[Al(C2O4)3.3H2O , it will show colorless.
What is paired electron?Paired electrons would be those in an atom which occur in pairs in an orbital, while un-paired electrons would be those in an atom that occur alone in an orbital.
Such metals were transition elements, meaning their compounds include un-paired electrons. These un-paired electrons easily create excited energy states, allowing photons to be absorbed and color to be produced.
Therefore, due to the presence of paired electrons complex will be colorless.
To know more about paired electron.
https://brainly.com/question/17647839.
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what is the volume in liters at STP of 14.5 grams of CO2 gas
Answer:
7.38 Liters
Explanation:
moles CO2 = 14.5g/44g/mol = 0.33 mole
At STP 1 mole of any gas occupies 22.4 Liters.
∴0.33 mole CO2 x 22.4 L/mol = 7.38 Liters
write the general strucktures of
A. ketone b. aldehyde c. carboxylic acid d. ester
A.ketone
R-CO-R
B.aldehyde
R-CH=O
c.carboxylic acid
R-COOH
d.ester
R-CO-O-C-R
What is the mass of 0.8 mole of water molecules.
Answer:14.4g
Explanation:
Which answer best describes the meaning of submerged?
The hurricane produced so much rain and flooding that cars were submerged.
drowned
damp
wet
underwater
Answer:
Drowned
Explanation:
We can use drown here, that sounds appropriate.
Need help on both questions. Only if you know.
6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal - exothermic
Remember: energy is conserved in a chemical reaction (visualize the reaction and question whether heat lies on reactant side (left) or product side (right))
-exothermic- heat is released (heat is on the product side)
>forming an ionic lattice (SALT)- mixture of Na and Cl results in a more stable ionic lattice, causing this reaction to be exothermic
>burning wood
-endothermic- heat is absorbed (heat is on the reactant side)
> cooking an egg
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
This base-catalyzed isomerization involves the following steps: 1. Deprotonation to form tetrahedral intermediate 1; 2. Collapse of the tetrahedral intermediate and bond cleavage to form enolate ion 2; 3. Proton transfer to form enolate ion 3; 4. Intramolecular aldol reaction to form tetrahedral intermediate 4. Write out the reaction on a separate sheet of paper, and then draw the structure of tetrahedral intermediate 1.
Answer:
Explanation:
The objective of this question is to show the stepwise reaction mechanism for the base-catalyzed isomerization. This mechanism is shown in the attached diagram below together with its intermediary and enolate ions.
Directions: Fill in the 12 steps in the decay of U-235 in the diagram below.
Begin with U-235 and finish with an
isotope of lead. The particles emitted in each step are listed below. Use the periodic table to find information about
mass numbers, atomic numbers, and chemical symbols. Place the correct symbol in the space corresponding to the
correct mass number and atomic number.
Answer:
SUPER MARIOLWEJHRTÑWQEGTPWIQETGQWKÑEJGBKSDLJBGKSJDLGB
Explanation:
A student has 2 rubber balls of the same size and weight. Ball A is still and Ball B is rolling.Ball B hits Ball A, and Ball A start moving. Why does Ball A start moving?
A). Ball A is repelled by Ball B ,
B). Ball B is attracted to Ball A ,
C). Ball B transfers energy to Ball A ,
D). Ball A transfers energy to Ball B
Answer:
C). Ball B transfers energy to Ball A
Explanation:
The motion of ball A is a because of the energy it acquires.
Ball A initially due to its position posses potential energy due to its position.
The moving ball B has kinetic energy due to the motion of this ball.
Due to the collision, momentum is transferred from the moving ball to the static one. As the momentum of the static ball changes, potential energy is converted to kinetic energy. The magnitude of the energy possessed by the static ball must be lesser than that of the moving.Answer:
c
Explanation:
The correct name for the compound N₂O₃ is *
Answer:
Dinitrogen trioxide.
Explanation:
The correct name for the compound [tex]N_2O_3[/tex] is dinitrogen trioxide. The compound [tex]N_2O_3[/tex] also happens to be a covalent compound, and the nomenclature of covalent compounds involves the usage of numerical prefixes such as "mono-" and "tri-".
Since there are two nitrogen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "di-", meaning two, to signify that.
Since there are three oxygen atoms in the compound [tex]N_2O_3[/tex], we can use the numerical prefix "tri-", meaning three, to signify that.
6. Think of some other chemical reactions. List them and the type of reaction: exothermic or endothermic. Example: Burning coal - exothermic
Explanation:
When Sulphuric acid is slowly poured into water in a beaker the beaker becomes hot and this is exothermic reaction
when ammonium chloride is dissolved in water in a beaker the beaker becomes cold and this is endothermic reaction
An example of an exothermic reaction is rusting or iron, nuclear fission. Examples of endothermic reactions are the melting of liquid and the evaporation of water.
What is a chemical reaction?A chemical reaction is a process in which one or two substances or compounds, called reactants, react or get mixed with each other and form a totally new compound called a product.
Exothermic reactions are those in which energy is released into the environment after the reaction. The reactant has more energy than the products.
Endothermic reactions are those in which energy is absorbed from the environment. The product has more energy than the reactants.
Thus, rusting on iron or nuclear fission are two examples of exothermic reactions. Liquid melting and water evaporation are two instances of endothermic processes.
To learn more about a chemical reaction, refer to the below link:
https://brainly.com/question/10373907
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boron is a non metal why
Explanation:
Boron is a non metallic element and the only non-metal of the group 13 of the periodic table the elements. Boron is electron-deficient, possessing a vacant p-orbital. ... It reacts with metals to form borides. At standard temperatures boron is a poor electrical conductor but is a good conductor at high temperatures
Which of the following equations demonstrates an actual chemical reaction that forms a new substance?
A1: ZN + 2HCl → 2NCl2 + H2
A2: H2O + NaCl → H2O
A3: Zn + Al + Cu → Zn + Cu + Al
A4: C12H22O11 + H2O → H2O + C12H22O11
Answer: [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
Explanation:
A chemical reaction is said to have occured when reactants react to form new products where the atoms undergo a change in bonding.
From the given reactions:
1. [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex]
Here Zn combines with hydrochloric acid to form zinc chloride and hydrogen.
2. [tex]H_2O+NaCl\rightarrow H_2O[/tex]
Here water remains as such as no new substance is formed.
3. [tex]Zn+Al+Cu\rightarrow Zn+Cu+Al[/tex]
Here no new substance is formed.
4. [tex]C_{12}H_{22}O_{11}+H_2O\rightarrow H_2O+C_{12}H_{22}O_{11}[/tex]
Here no new substance is formed.
Thus [tex]Zn+2HCl\rightarrow ZnCl_2+H_2[/tex] demonstrates an actual chemical reaction that forms a new substance
Answer:
hope this helps you!
Explanation:
—————————Are formed by a combination of two or more different kinds of Atom
Atom of the same ———————————-element have identical properties
Answer:
1. molecules.
2. size ,shape and mass.
which will dissolve faster in water rock salt or granulated salt
Answer:
Salt!!!
Explanation:
how much CaCO3 would have to be decomposed to produce 247 g of CaO
441 g CaCO₃ would have to be decomposed to produce 247 g of CaO
Further explanationReaction
Decomposition of CaCO₃
CaCO₃ ⇒ CaO + CO₂
mass CaO = 247 g
mol of CaO(MW=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{247}{56}\\\\mol=4.41[/tex]
From equation, mol ratio CaCO₃ : CaO = 1 : 1, so mol CaO :
[tex]\tt \dfrac{1}{1}\times 4.41=4.41[/tex]
mass CaCO₃(MW=100 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=4.41\times 100\\\\mass=441~g[/tex]
A rigid, 28-L steam cooker is arranged with a pressure relief valve set to release vapor and maintain the pressure once the pressure inside the cooker reaches 150 kPa. Initially, this cooker is filled with water at 175 kPa with a quality of 10 percent. Heat is now added until the quality inside the cooker is 40 percent. The water is stirred at the same time that it is being heated. Determine the minimum entropy change of the heat-supplying source if 100 kJ of work is done on the water as it is being heated. Use steam tables.
Answer:
[tex]\Delta S_{source}>-1.204\frac{kJ}{K}[/tex]
Explanation:
Hello!
In this case, given the initial conditions, we first use the 10-% quality to compute the initial entropy:
[tex]s_1=s_{f,175kPa}+q*s_{fg,175kPa}\\\\s_1=1.4850\frac{kJ}{kg*K} +0.1*5.6865\frac{kJ}{kg*K}=2.0537\frac{kJ}{kg*K}[/tex]
Now the entropy at the final state given the new 40-% quality:
[tex]s_2=s_{f,150kPa}+q*s_{fg,150kPa}\\\\s_2=1.4337\frac{kJ}{kg*K} +0.4*5.7894\frac{kJ}{kg*K}=3.7495\frac{kJ}{kg*K}[/tex]
Next step is to compute the mass of steam given the specific volume of steam at 175 kPa and the 10% quality:
[tex]m_1=\frac{0.028m^3}{(0.001057+0.1*1.002643)\frac{m^3}{kg} } =0.274kg\\\\m_2=\frac{0.028m^3}{(0.001053+0.4*1.158347)\frac{m^3}{kg} } =0.0603kg[/tex]
Then, we can write the entropy balance:
[tex]\Delta S_{source}+\frac{Q}{T_1} -\frac{Q}{T_2} +s_2m_2-s_1m_1-s_{fg}(m_2-m_1)>0[/tex]
Whereas sfg stands for the entropy of the leaving steam to hold the pressure at 150 kPa and must be greater than 0; thus we plug in:
Which is such minimum entropy change of the heat-supplying source.
Best regards!
how many moles of MgO are there in 403.1g of MgO
Answer: mark as Brainliest
10 moles
Explanation:
moles=mass/molar mass, therefore 403.1/(24.31+16)=10
Answer:
10 moles
Explanation:
moles=mass/molar mass, therefore 403.1/(24.31+16)=10
The EPA tracks the amount of DDT that has entered into our water systems to ensure water safety. Calculate the ppm for a solution made by putting 2.7 g of DDT into a 59000 g of water. Assume masses are additive
a. 46 ppm
b. 0.0046 ppm
c. 4.6 ppm
d. 4.6 x 10^-5 ppm
How many protons, electrons, and neutrons? ANSWEN
2+
23
6521
26
Protons
Electrons
Neutrons
28
30
65
3-
31
Protons
Electrons
Neutrons
"As
57 Fe
32
3+
33
35
36
DRAGO
Protons
Electrons
Neutrons
14
ME
US
Answer:
maybe 20 butvam not sure ooo
Write down the name and symbol of the particle formed when the magnesium atom loses two electrons
Answer:
A magnesium atom must lose two electrons to have the same number electrons as an atom of the previous noble gas, neon. Thus, a magnesium atom will form a cation with two fewer electrons than protons and a charge of 2+. The symbol for the ion is Mg2+, and it is called a magnesium ion.
Water is a substance made up of the elements hydrogen
and oxygen.
How many types of atoms make up a particle of water?
A. 2
B. 3
C. 4
D. 1
Answer:
A. 2
Explanation:
A particle of water is made up of two hydrogen atoms and one oxygen atom. However, the question asked for how many types of atoms there are, so the answer is 2.
What is the conjugate acid of the acetate ion?
Answer:
Hydronium ion is the conjugate acid of water.
Exaplination:Acetic acid is the conjugate acid of acetate ion. Hydronium ion is the conjugate acid of water.
How many moles are in
.77 liters of Br2 at STP?
Answer: 0.034354
Explanation:1 mole=22.4 liters of Br2 at STP so, 22.4x=0.77
x= 0.034354
Answer:
0.034354
Explanation:
Just did worksheet
? C+? O2 +? CO2,
what is the maximum amount of CO2 which
could be formed from 13.19 g of C and 15.92 g
of O2?
Answer in units of g.
Look at the mole ratio in the balanced equation
2CO + O2 ==> 2CO2
3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO