D. Elements within a group have similar properties.
What is ∆H for the reaction of sulfur dioxide with oxygen?
2SO2(g) + O2(g) → 2SO3(g)
(∆Hf0 SO2(g) = –296.8 kJ/mol; ∆Hf0 SO3(g) = –395.7 kJ/mol)
A.)–98.9 kJ
B.)–197.8 kJ
C.)1.385 × 103 kJ
D.)197.8 kJ
Answer:
B.) –197.8 kJ
Balanced equation : 2SO₂(g) + O₂(g) → 2SO₃(g)
Given:
SO₂(g) = –296.8 kJ/molSO₃(g) = –395.7 kJ/mol================================================================
products : 2 ( –296.8 ) + O₂ = -593.6 kJ/mol + O₂reactant : 2 ( –395.7 ) = -791.4 kJ/molproducts energy = reactant energy
-593.6 + O₂ = -791.4
O₂ = -791.4 - ( -593.6)
O₂ = –197.8 kJ
A chemist is studying a chemical compound that
has equal numbers of carbon atoms and hydrogen atoms. She calculates that the
carbon atoms have a mass of 24 grams. What is the mass of the hydrogen atoms?
Explain your reasoning.
The mass of hydrogen atoms in the compound would be 2 grams.
Stoichiometric calculationThe carbon atoms in the compound have a mass of 24 grams.
One carbon atom has a mass of 12 grams. Thus, there are two (12 x 2 = 24) carbon atoms in the compound.
This means that there are also two hydrogen atoms in the compound. One hydrogen atom weighs 1 gram. Hence, the mass of the hydrogen atoms in the compound will be 2 grams.
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H2(g) + Cl2(g) ⟶ 2HCl(g)
If 3.7 liters of Cl2 are used for this reaction, how much HCl will be formed? Assume there are enough reactants to complete the reaction and assume the reaction occurs at STP.
The volume of hydrochloric acid, HCl produced from the reaction when 3.7 L of Cl₂ are used is 7.4 L
Balanced equationH₂ + Cl₂ —> 2HCl
Since the reaction occurs at standard temperature and pressure (STP), we can say that:
From the balanced equation above,
1 L of Cl₂ reacted to produce 2 L of HCl
How to determine the volume of HCl producedFrom the balanced equation above,
1 L of Cl₂ reacted to produce 2 L of HCl
Therefore,
3.7 L of Cl₂ will react to produce = 3.7 × 2 = 7.4 L of HCl
Thus, the volume of HCl produced from the reaction is 7.4 L
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ohesion between water molecules contributes to __________ which allows the molecules to stick together and resist outside forces.
Answer: I believe the answer is surface tension :)
6.
The temperature of a 250.0 g ball of iron increases from 19 C to 32 C. How much heat
did the iron ball gain?
The temperature of a 250.0 g ball of iron increases from 19 C to 32 C. How much heat
did the iron ball gain?
A gas sample has a temperature of 19 °C with an unknown volume. The
same gas has a volume of 464 mL when the temperature is 90. °C, with no
change in the pressure or amount of gas.
Answer: 373 mL
Explanation:
Since there is no change in pressure, the formula: V / T = V / T can be used.
However, you must first convert the temperatures to Kelvin by adding 273 to them:
(19 + 273) = 292K and (90 + 273) = 363K.
Now, plug in: V / 292 = 464 / 363 → V = 373 mL :)
A mixture of three gases has a total pressure of 94.5 kpa. if the partial pressure of
the 1st gas is 65.4 kpa and the partial pressure of the 2nd gas is 22.4 kpa, what is the
partial pressure of the 3rd gas of the mixture?
Answer: 6.7 kPa
Explanation:
Pressure Total = P(partial 1) + P(partial 2) + P(partial 3) →
94.5 kPa = 65.4 kPa + 22.4 kPa + P(partial 3) →
6.7 = P(partial 3) :)
According to the Dalton's law of partial pressures the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture.
So, P[tex]_o[/tex] = P[tex]_1[/tex]+ P[tex]_2[/tex]+ P[tex]_3[/tex]
[tex]\longrightarrow[/tex]94.5 = 65.4+ 22.4 + P[tex]_3[/tex]
[tex]\longrightarrow[/tex]94.5 = 87.8+ P[tex]_3[/tex]
[tex]\longrightarrow[/tex] P[tex]_3[/tex] = 94.5 - 87.8
[tex]\longrightarrow[/tex]P[tex]_3[/tex] = 6.7 kpa
Therefore, partial pressure of the 3rd gas of the mixture is 6.7 kpa .
The molar mass of water (h2o) is 18.0 g/mol. a sample of water has a mass of 18.0 g. how many moles of water are contained in this sample? 1.00 mole 18.0 moles 36.0 moles 324 moles
The moles of water are contained in the given sample is 1 mole.
How do we calculate moles?Moles of any substance will be calculated by using the below formula:
n = W/M , where
W = required mass
M = molar mass
Given molar mass of H₂O = 18.0 g/mol
Given mass of H₂O = 18.0 g
Moles of H₂O = 18.0 g / 18.0 g/mol = 1 moles
Hence option (1) is correct.
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Answer:
A. 1.00 Mole
Explanation:
edg 2023
Consider the two‑step synthesis of 2‑hydroxy‑2,4‑dimethylpentanoic acid using the reagents provided
The two step synthesis 2‑hydroxy‑2,4‑dimethyl pentanoic acid of involves compounds as represented in the attached image.
Two step synthesis of organic compoundsFrom the task content:
It therefore follows that the Starting compound A and intermediate compound B are as represented in the attached image.
Compound A is 4-methyl pentan-2-oneRemarks: The reagents provided are, H3O, Potassium cyanide and Hydrogen cyanide.
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How many molecules of water are made from 2 molecules of h2?
Answer:
Given the balanced reaction, note that there are two molecules of water produced for every two molecules of H2
Explanation:
There are two molecules of water is produced from 2 molecules of hydrogen.
What is hydrogen?It is the lightest element which is colorless, tasteless, and non-toxic.
Water is made up of hydrogen and oxygen, with a good amount of heat to carry out the reaction.
The equation is
[tex]\rm 2H_2O + O_2 = 2H_2O[/tex]
It is clear that two molecules of hydrogen produce two molecules of water.
Thus, there are two molecules of water is produced from 2 molecules of hydrogen.
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if 146.5 g of chromium(lll) chlorate decomposes, what mass of oxygen can be produced?
Answer:
The Equation for this reaction is as follow,
2 Cr(ClO₃)₃ → 2 CrCl₃ + 9 O₂
According to eq,
604.68 g (2mole) of Cr(ClO₃)₃ produces = 288 g (9 moles) of O₂
So,
146.5 g of Cr(ClO₃)₃ will produce = X g of O₂
Solving for X,
X = (146.5 g × 288 g) ÷ 604.68 g
X = 69.77 g of O₂
How many liters of carbon gas are in 13.7 moles of carbon dioxide gas at STP?
At STP
1 mol weighs 22.4LNo of moles=13.7mol
Total volume:-
13.7(22.4)306.88L[/tex]The volume of gas occupied by 13.7 moles at STP is 306.88L.
What is STP?
STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.
According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -
Temperature of 0 degree celsius (273K)Pressure of 1 atmIt is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.
One mole of a gas under STP conditions occupies a volume of 22.4L.
Given,
Moles of carbon dioxide gas = 13.7 moles
We know that,
1 mole of a gas occupies 22.4 L of volume at STP.
Thus, 13.7 moles will occupy 13.7 × 22.4 L
= 306.88 L
Therefore, the volume of gas occupied at STP is 306.88L.
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What does it mean a solution is a weak base"? What about a "Strong base"? Give logical pH values for each
Answer:
A weak base is a base that, upon dissolution in water, does not dissociate completely, so that the resulting aqueous solution contains only a small proportion of hydroxide ions. PH 7-10
A strong base is a base that is completely dissociated in an aqueous solution. a PH of about 12-14
Which equation shows conservation of both mass and charge?
(1) Cl2 + Br→ Cl- + Br,
(2) Cu + 2 Agt → Cu2+ + Ag
(3) Zn + Cr3+ → Zn2+ + Cr
(4) Ni + Pb2+ → Ni2+ + Pb
The equation that shows conservation of both mass and charge is:
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
What do conservation of mass and conservation of charge stand for?Conservation of mass: there is the same mass, i.e. same number of atoms, in the reactants and in the products.Conservation of charge: there is the same electrical charge in the reactants and in the products.Which equation shows conservation of both mass and charge?
(1) Cl₂ + Br → Cl⁻ + Br
No, the equation does not show conservation of mass nor charge.
(2) Cu + 2 Ag⁺ → Cu²⁺ + Ag
No, the equation does not show conservation of mass.
(3) Zn + Cr³⁺ → Zn²⁺ + Cr
No, the equation does not show conservation of charge.
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
Yes, the equation show conservation of mass and charge.
The equation that shows conservation of both mass and charge is:
(4) Ni + Pb²⁺ → Ni²⁺ + Pb
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Which of the following are duplicated during cell division in a human cell?.
All cell constituents are duplicated during cell division in a human cell i.e. mitosis and meiosis type of cell division.
What are duplicated during cell division in a human cell?During mitosis, a cell duplicates all of its internal parts and formed two identical daughter cells. During duplication, all parts have two sets which is equally distributed into two daughter cells in mitosis type of cell division.
While on the other hand, during meiosis, a cell divides into four daughter cells having haploid chromosomes i.e. half number of chromosomes.
So we can conclude that cell constituents are are duplicated during cell division in a human cell.
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PLEASE HURRY THIS IS DUE IN 4 MINUTES!!! 3. In the understory, all of the following are true except
A. The understory has a hot, humid environment.
B. Leaves are bigger in the understory than the other layers because not much sunlight reaches this area.
C. Jaguars and leopards live in the understory.
D. Insects, bees, ants, and beetles live in the understory.
Answer:
WHERES THE UNDER STORY! POST IT QUICK AND ILL HELP
Explanation:
100 pOiNtS
Explain why the vapor pressure of a solution differs from that of the pure solvent
Explain why the freezing point of a solution differs from that of the pure solvent
Explain why the boiling point of a solution differs from that of the pure solvent
Answer:
Answer one:
Solute particles block some of the ability of liquid particles to evaporate. We can then conclude, solutions of solid solutes typically have a lower vapor pressure than pure solvents.
Answer two:
Solutions freezing points are lower than of the pure solvent or solute because freezing (becoming a solid) creates order and decreases entropy.
Answer three:
The presence of solute particles decreases the vapor pressure of the liquid solvent, this means a higher temperature is needed to reach the boiling point.
Explanation:
Have a great rest of your day
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60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf v = 62.7 \ L}[/tex]
Explanation:
Given Data:
Mole = n = 3.38 mol
Temp = t = 269 K
Pressure = 1.19 atm
Gas constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(3.38)(0.08206)(269)}{1.19} \\\\v = \frac{74.6}{1.19} \\\\v = 62.7 \ L\\\\\rule[225]{225}{2}[/tex]
Arrange the following bonds in order of increasing ionic character. assign number 1 as the highest and 6 as the lowest. a. carbon-hydrogen
b. fluorine-hydrogen
c. bromine-hydrogen
d. sodium-chlorine
e. potassium-fluorine
f. lithium-chlorine
How do the names of molecular compounds differ from the names of ionic compounds.
Long Answer:
Ionic: Cation is named first followed by the anion.
If it's an ionic compound with a transition metal, there are more than one possible ion. Molecular - named with the least electronegative ion first + prefixes are given to both ions to indicate number of atoms in each element.
Short Answer: Ionic compounds- Cation is named first, followed by the anion.
A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
Answer:
The mass of NaCl needed for the reaction is 91.61 g
We'll begin by calculating the number of mole of F₂ that reacted.
Volume (V) = 12 L
Temperature (T) = 280 K
Pressure (P) = 1.5 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
PV = nRT
1.5 × 12 = n × 0.0821 × 280
18 = n × 22.988
Divide both side by 22.988
n = 18 / 22.988
n = 0.783 mole
Next, we shall determine the mole of NaCl needed for the reaction.
F₂ + 2NaCl —> Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
Therefore,
0.783 mole F₂ will react with = 0.783 × 2 = 1.566 moles of NaCl.
Finally, we shall determine the mass of 1.566 moles of NaCl.
Mole = 1.566 moles
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl =?
Mass = mole × molar mass
Mass of NaCl = 1.566 × 58.5
Mass of NaCl = 91.61 g
Therefore, the mass of NaCl needed for the reaction is 91.61 g
Explanation:
Hurrrryyyyy pls
Based on the experiment below, what was the dependent variable?
Bean
Soil
Bean
Soil
Bean
Soil
Height 20.4 cm
Mass: 159
Height: 45.7 cm
Mass: 6.19
Height: 46.5 cm
Mass: 6.69
LI
Daily water 10 mL
A Daily water 50 mL
B
Daily water 100 mL
С
Answer:
The growth of the plant
Explanation:
The growth of the plant from the bean soil is the dependent variable I believe. This is because it could change depending on many factors for e.g. the amount of light or water
Are all black holes the same size? Explain
Answer:
According to my search, the answer is this.
Black holes come in several different sizes which are defined by their mass. Small black holes are usually the result of a relatively short and violent collapse of a star.
Explanation:
It only has mass. The amount of matter that has fallen into the black hole determines its mass. The more mass/matter a singularity has the larger its event horizon. So, the greater the black hole's mass the larger it is.
Answer: Black holes come in several different sizes which are defined by their mass. Small black holes are usually the result of a relatively short and violent collapse of a star.
Explanation:
Draw the structures of the aldol addition and condensation products of cyclopentanone
The term aldol condensation has to do with a reation in which a nucleophile attacks the carbonyl group of an aldehyde.
What is alodol condensation?The term aldol condensation has to do with a reation in which a nucleophile attacks the carbonyl group of an aldehyde or a ketone to convert it to the enolate from which attacks another aldehyde or ketone at the carbonyl carbon to form the required product.
The structure of the organic product from the aldol condensation involving cyclopentanone is shown in the image attached to this answer.
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What does a coefficient tell you?
The coefficient tells you how many molecules of that substance there is.
The addition of a catalyst to a system at equilibrium will increase the rate of:.
Answer:
forward and reverse reaction rates
Explanation:
meaning the equilibrium is reached faster. So if the reaction is already at equilibrium there will be no effect on a concentration-time or moles-time graph.
How is an element called if the number of neutrons exceed the number of protons?.
Answer:
In a heavier nucleus, the repulsive force between the protons is very high. For stability, the nuclear force must dominate this electrostatic repulsive force. This is possible if the number of neutrons is greater than number of protons.
6. How did humans help the bison from being hunted to extinction?
Answer:
✒️Answer:Bison were saved through the combined efforts of conservationists, scientists, ranchers and ultimately the general public. As their comeback continues, I believe that they can teach us how to be better stewards of the land and provide a future for the Plains where ecosystems and human cultures thrive.
Explanation:
#CarryOnLearning[tex]watch.some.anime[/tex]
Hydrogen peroxide and potassium permanganate balanced equation
Answer:
2 KMnO4 + H2O2 → 2 MnO2 + 2 O2 + 2 KOH - Balanced equation
why is the non-luminous flame preferred for heating?
Answer:
Because it is the hottest zone
Answer:
the non luminous flames are very hot. little light is produced by non luminous flames.