Question 1

At STP,which sample contains twice the number of molecules found in 4.00 L of hydrogen gas?

Accepted Answer

A)  1.00 L of He
B)  2.00 L of He
C)  4.00 L of He
D)  8.00 L of He

Question 2

The volume of one mole of any gas at STP is 22.4 L.

Accepted Answer

A) True 
 B)False

Question 3

When the following reaction took place at 23.8 °C and a pressure of 758 torr,3.90 L of O2(g) were collected.What mass of KClO3 decomposed? 2KClO3(s)  2(g) were collected.What mass of KClO3 decomposed? 2KClO3(s)    2KCl(s) + 3O2(g)  A) 163 g B) 19.6 g C) 13.0 g D) 39.1 g" class="answers-bank-image d-inline" rel="preload" > 2KCl(s) + 3O2(g)

Accepted Answer

A)  163 g
B)  19.6 g
C)  13.0 g
D)  39.1 g

Question 4

Which gas would have the lowest velocity at 280 K?

Accepted Answer

A)  Ar
B)  Ne
C)  H2
D)  CO

Question 5

A mixture containing 5.00 g of H2(g) and 10.0 g of O2(g) is allowed to react in a 15.0 L rigid container at a constant temperature of 25.0°C. 2H2(g) + O2(g)  2(g) and 10.0 g of O2(g) is allowed to react in a 15.0 L rigid container at a constant temperature of 25.0°C. 2H2(g) + O2(g)    2H2O(l)  Once the reaction is complete,what will be the pressure of the excess gas inside the container? A) 1.51 atm B) 4.04 atm C) 3.53 atm D) 3.02 atm" class="answers-bank-image d-inline" rel="preload" > 2H2O(l) 
Once the reaction is complete,what will be the pressure of the excess gas inside the container?

Accepted Answer

A)  1.51 atm
B)  4.04 atm
C)  3.53 atm
D)  3.02 atm D

Question 6

The volume of a gas must always decrease when

Accepted Answer

A)  temperature increases and pressure increases.
B)  temperature increases and pressure decreases.
C)  temperature decreases and pressure increases.
D)  temperature decreases and pressure decreases.

Question 7

Under which set of conditions will a real gas be least likely to act as an ideal gas?

Accepted Answer

A)  High temperature and high pressure
B)  High temperature and low pressure
C)  Low temperature and high pressure
D)  Low temperature and low pressure

Question 8

A mixture of gases consists of helium at a partial pressure of 400.torr,neon at a partial pressure of 300.torr,and argon at a partial pressure of 200.torr.What is the total pressure of this mixture of gases?

Accepted Answer

A)  300.torr
B)  760.torr
C)  900.torr
D)  1000 torr

Question 9

The volume of a gas,at constant temperature,is inversely proportional to its pressure.

Accepted Answer

A) True 
 B)False

Question 10

What is the molar mass of a gas if 12.0 L of the gas at STP has a mass of 16.0 grams?

Accepted Answer

A)  8.57 g
B)  22.4 g
C)  16.8 g
D)  29.9 g

Question 11

What is the volume of 0.132 moles of carbon dioxide gas at STP?

Accepted Answer

A)  2.96 L
B)  5.81 L
C)  170.L
D)  333 L

Question 12

What is the density of nitrogen gas at STP?

Accepted Answer

A)  0.625 g/L
B)  0.799 g/L
C)  1.60 g/L
D)  1.25 g/L

Question 13

Which of the following is not an assumption under KMT?

Accepted Answer

A)  Gas particles have no attraction for one another.
B)  During a collision,energy is lost by the gas particles and later is regained.
C)  Gases at the same temperature have the same average kinetic energy.
D)  Gas particles move in straight lines in all directions.

Question 14

What mass of water is produced when 10.0 L of oxygen react completely in the following equation? 2 H2(g) + O2(g)  →\rarr→  2 H2O(l)

Accepted Answer

A)  4.02 g
B)  16.1 g
C)  20.1 g
D)  80.7 g

Question 15

What volume of ammonia is produced when 0.500 mole of nitrogen reacts completely in the following equation?
N2(g) + 3 H2(g)  →\rarr→ 2NH3(g)

Accepted Answer

A)  1.00 L
B)  22.4 L
C)  44.8 L
D)  11.2 L

Question 16

Which gas is most dense at STP?

Accepted Answer

A)  Helium
B)  Nitrogen
C)  Oxygen
D)  Hydrogen

Question 17

The rate of effusion of two gases is directly proportional to their molar masses.

Accepted Answer

A) True 
 B)False

Question 18

A sample of gas has a volume of 200.mL at 20.0 ° C.What will be its volume at 40.0 °C, pressure remaining constant?

Accepted Answer

A)  18.8 mL
B)  214 mL
C)  100.mL
D)  400.mL B

Question 19

How many moles of oxygen are consumed when 100.L of dinitrogen pentoxide are produced in the following equation?
 2 N2(g) + 5 O2(g)  →\rarr→  2 N2O5(g)

Accepted Answer

A)  0.560 moles
B)  1.79 moles
C)  0.0896 moles
D)  11.2 moles

Question 20

What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 765 torr and 20.0 °C?

Accepted Answer

A)  0.0352 g
B)  28.4 g
C)  26.8 g
D)  1.94 g B

Exam 12: The Gaseous State of Matter

At STP,which sample contains twice the number of molecules found in 4.00 L of hydrogen gas?

Correct AnswerverifiedShow Answer

The volume of one mole of any gas at STP is 22.4 L.

Correct AnswerverifiedShow Answer

When the following reaction took place at 23.8 °C and a pressure of 758 torr,3.90 L of O2(g) were collected.What mass of KClO3 decomposed? 2KClO3(s) 2KCl(s) + 3O2(g)

Correct AnswerverifiedShow Answer

Which gas would have the lowest velocity at 280 K?

Correct AnswerverifiedShow Answer

A mixture containing 5.00 g of H2(g) and 10.0 g of O2(g) is allowed to react in a 15.0 L rigid container at a constant temperature of 25.0°C. 2H2(g) + O2(g) 2H2O(l) Once the reaction is complete,what will be the pressure of the excess gas inside the container?

Correct AnswerverifiedD

The volume of a gas must always decrease when

Correct AnswerverifiedShow Answer

Under which set of conditions will a real gas be least likely to act as an ideal gas?

Correct AnswerverifiedShow Answer

A mixture of gases consists of helium at a partial pressure of 400.torr,neon at a partial pressure of 300.torr,and argon at a partial pressure of 200.torr.What is the total pressure of this mixture of gases?

Correct AnswerverifiedShow Answer

The volume of a gas,at constant temperature,is inversely proportional to its pressure.

Correct AnswerverifiedShow Answer

What is the molar mass of a gas if 12.0 L of the gas at STP has a mass of 16.0 grams?

Correct AnswerverifiedShow Answer

What is the volume of 0.132 moles of carbon dioxide gas at STP?

Correct AnswerverifiedShow Answer

What is the density of nitrogen gas at STP?

Correct AnswerverifiedShow Answer

Which of the following is not an assumption under KMT?

Correct AnswerverifiedShow Answer

What mass of water is produced when 10.0 L of oxygen react completely in the following equation? 2 H2(g) + O2(g) →\rarr→ 2 H2O(l)

Correct AnswerverifiedShow Answer

What volume of ammonia is produced when 0.500 mole of nitrogen reacts completely in the following equation? N2(g) + 3 H2(g) →\rarr→ 2NH3(g)

Correct AnswerverifiedShow Answer

Which gas is most dense at STP?

Correct AnswerverifiedShow Answer

The rate of effusion of two gases is directly proportional to their molar masses.

Correct AnswerverifiedShow Answer

A sample of gas has a volume of 200.mL at 20.0 ° C.What will be its volume at 40.0 °C, pressure remaining constant?

Correct AnswerverifiedB

How many moles of oxygen are consumed when 100.L of dinitrogen pentoxide are produced in the following equation? 2 N2(g) + 5 O2(g) →\rarr→ 2 N2O5(g)

Correct AnswerverifiedShow Answer

What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 765 torr and 20.0 °C?

Correct AnswerverifiedB

Correct Answer
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Correct Answer
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When the following reaction took place at 23.8 °C and a pressure of 758 torr,3.90 L of O₂(g) were collected.What mass of KClO₃ decomposed? 2KClO₃(s) 2KCl(s) + 3O₂(g)

Correct Answer
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Correct Answer
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A mixture containing 5.00 g of H₂(g) and 10.0 g of O₂(g) is allowed to react in a 15.0 L rigid container at a constant temperature of 25.0°C. 2H₂(g) + O₂(g) 2H₂O(l) Once the reaction is complete,what will be the pressure of the excess gas inside the container?

Correct Answer
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D

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Correct Answer
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What mass of water is produced when 10.0 L of oxygen react completely in the following equation? 2 H₂(g) + O₂(g) $\rarr$ 2 H₂O(l)

Correct Answer
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What volume of ammonia is produced when 0.500 mole of nitrogen reacts completely in the following equation? N₂(g) + 3 H₂(g) $\rarr$ 2NH₃(g)

Correct Answer
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Correct Answer
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Correct Answer
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A sample of gas has a volume of 200.mL at 20.0^°C.What will be its volume at 40.0^°C, pressure remaining constant?

Correct Answer
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B

How many moles of oxygen are consumed when 100.L of dinitrogen pentoxide are produced in the following equation? 2 N₂(g) + 5 O₂(g) $\rarr$ 2 N₂O₅(g)

Correct Answer
verified

What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 765 torr and 20.0^°C?

Correct Answer
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B