Question 1

Which one of these will diffuse the fastest at 25°C?

Accepted Answer

A)   2.0 M Ar
B)   1.0 M H2
C)   2.0 M N2
D)   0.5 M Ne
E)   2.0 M O2F) A) and E)
G) B) and D)

Question 2

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

Accepted Answer

A)   2.0 L
B)   0.50 L
C)   39 L
D)   13 L
E)   4.4 LF) A) and D)
G) B) and E)

Question 3

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

Accepted Answer

A)   0.600 moles
B)   0.0667 moles
C)   2.40 moles
D)   0.0960 molesE) None of the above
F) A) and D)

Question 4

A 55.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Accepted Answer

A)   3.17 g
B)   8.20 g
C)   82.9 g
D)   1210 gE) All of the above
F) B) and C)

Question 5

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

Accepted Answer

A)   Ne
B)   Ar
C)   F2
D)   N2E) All of the above
F) B) and D) D

Question 6

Give the gas that is the lowest percent by volume in dry gas.

Accepted Answer

A)   CO2
B)   He
C)   H2
D)   N2E) A) and D)
F) B) and C)

Question 7

A 1.000 kg sample of nitroglycerine,C3H5N3O9,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced?
4 C3H5N3O9(s) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g)

Accepted Answer

A)   742.2 L
B)   3525 L
C)   4730 L
D)   5378 LE) A) and B)
F) A) and C) D

Question 8

Calcium hydride (  ) reacts with water to form hydrogen gas:  (s) +  O(l) →  (aq) +  (g)  How many grams of  are needed to generate 48.0 L of  gas at a pressure of 0.888 atm and a temperature of 32°C?

Accepted Answer

A)   50.7
B)   0.851
C)   143
D)   35.8
E)   71.7F) A) and D)
G) A) and C)

Question 9

What pressure will 2.6 × 1023 molecules of N2 exert in a 3.9 L container at 45°C?

Accepted Answer

A)   5.7 atm
B)   1.7 atm
C)   2.9 atm
D)   3.4 atm
E)   4.6 atmF) B) and D)
G) B) and E)

Question 10

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.350 and the pressure of H2 is 0.480 atm?

Accepted Answer

A)   1.37 atm
B)   0.168 atm
C)   5.95 atm
D)   0.729 atm
E)   2.1 atmF) D) and E)
G) A) and D) A

Question 11

Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?

Accepted Answer

A)   N2
B)   O2
C)   Kr 
D)   Rn E) A) and B)
F) A) and C)

Question 12

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

Accepted Answer

A)   26.3 g/mol
B)   33.9 g/mol
C)   12.2 g/mol
D)   38.0 g/mol
E)   81.8 g/molF) B) and C)
G) A) and E)

Question 13

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

Accepted Answer

A)   0.0941 L
B)   13.5 L
C)   2.13 L
D)   27.9 L
E)   0.138 LF) All of the above
G) A) and B)

Question 14

Place the following gases in order of increasing density at STP. F2 NH3 N2O4 Ar

Accepted Answer

A)   N2O4 2 3
B)   Ar 2O4 2 3
C)   F2 2O4 3
D)   NH3 2 2O4
E)   Ar 2 3 2O4F) C) and E)
G) B) and D)

Question 15

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg?
N2(g) + 3 H2(g) → 2 NH3(g)

Accepted Answer

A)   0.0150 mol
B)   0.00782 mol
C)   0.00501 mol
D)   0.00167 mol
E)   0.0382 molF) C) and D)
G) B) and C)

Question 16

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Accepted Answer

A)   15 g H2
B)   15 g Ar
C)   15 g Kr
D)   15 g CO2
E)   All of these samples will have the same pressure.F) A) and B)
G) B) and C)

Question 17

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

Accepted Answer

A)   6.50 L
B)   1.84 L
C)   2.75 L
D)   32.9 L
E)   0.364 LF) A) and E)
G) B) and E)

Question 18

Rank the following in order of decreasing rate of effusion. F2 SF6 He Ar

Accepted Answer

A)   SF6 > Ar > F2 > He
B)   Ar > He > SF6 > F2
C)   F2 > Ar > He > SF6
D)   He > F2 > Ar > SF6
E)   He > F2 > SF6 > ArF) C) and D)
G) B) and C)

Question 19

Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn(s) +   (aq) → Zn  (aq) +  (g) 
In an experiment,201 mL of wet  is collected over water at 27°C and a barometric pressure of  The vapor pressure of water at 27°C is 26.74 torr.The partial pressure of hydrogen in this experiment is ________ atm.

Accepted Answer

A)   0.929
B)   706
C)   0.964
D)   760
E)   1.00F) None of the above
G) B) and D)

Question 20

Arrange the gases according to increasing rate of diffusion at 50°C.

Accepted Answer

A)   NO2 2 2
B)   O2 2 2
C)   O2 2 2
D)   SO2 2 2
E)   SO2 2 2F) A) and E)
G) A) and B)

Exam 11: Gases

Which one of these will diffuse the fastest at 25°C?

Correct Answer
verified

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

Correct Answer
verified

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

Correct Answer
verified

A 55.0-L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Correct Answer
verified

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

Correct Answer
verified
D

Give the gas that is the lowest percent by volume in dry gas.

Correct Answer
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A 1.000 kg sample of nitroglycerine,C₃H₅N₃O₉,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced? 4 C₃H₅N₃O₉(s) → 12 CO₂(g) + 10 H₂O(g) + 6 N₂(g) + O₂(g)

Correct Answer
verified
D

Calcium hydride ( ) reacts with water to form hydrogen gas: (s) + O(l) → (aq) + (g) How many grams of are needed to generate 48.0 L of gas at a pressure of 0.888 atm and a temperature of 32°C?

Correct Answer
verified

What pressure will 2.6 × 10²³ molecules of N₂exert in a 3.9 L container at 45°C?

Correct Answer
verified

A gas mixture contains CO,Ar and H₂.What is the total pressure of the mixture,if the mole fraction of H₂ is 0.350 and the pressure of H₂ is 0.480 atm?

Correct Answer
verified
A

Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?

Correct Answer
verified

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

Correct Answer
verified

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

Correct Answer
verified

Place the following gases in order of increasing density at STP. F₂ NH₃ N₂O₄ Ar

Correct Answer
verified

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg? N₂(g) + 3 H₂(g) → 2 NH₃(g)

Correct Answer
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Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Correct Answer
verified

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

Correct Answer
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Rank the following in order of decreasing rate of effusion. F₂ SF₆ He Ar

Correct Answer
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Correct Answer
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Arrange the gases according to increasing rate of diffusion at 50°C.

Correct Answer
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Exam 11: Gases

Which one of these will diffuse the fastest at 25°C?

Correct AnswerverifiedShow Answer

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

Correct AnswerverifiedShow Answer

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

Correct AnswerverifiedShow Answer

A 55.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Correct AnswerverifiedShow Answer

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

Correct AnswerverifiedD

Give the gas that is the lowest percent by volume in dry gas.

Correct AnswerverifiedShow Answer

A 1.000 kg sample of nitroglycerine,C3H5N3O9,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced? 4 C3H5N3O9(s) → 12 CO2(g) + 10 H2O(g) + 6 N2(g) + O2(g)

Correct AnswerverifiedD

Calcium hydride ( ) reacts with water to form hydrogen gas: (s) + O(l) → (aq) + (g) How many grams of are needed to generate 48.0 L of gas at a pressure of 0.888 atm and a temperature of 32°C?

Correct AnswerverifiedShow Answer

What pressure will 2.6 × 1023 molecules of N2 exert in a 3.9 L container at 45°C?

Correct AnswerverifiedShow Answer

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.350 and the pressure of H2 is 0.480 atm?

Correct AnswerverifiedA

Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?

Correct AnswerverifiedShow Answer

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

Correct AnswerverifiedShow Answer

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

Correct AnswerverifiedShow Answer

Place the following gases in order of increasing density at STP. F2 NH3 N2O4 Ar

Correct AnswerverifiedShow Answer

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg? N2(g) + 3 H2(g) → 2 NH3(g)

Correct AnswerverifiedShow Answer

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume) ?

Correct AnswerverifiedShow Answer

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

Correct AnswerverifiedShow Answer

Rank the following in order of decreasing rate of effusion. F2 SF6 He Ar

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Arrange the gases according to increasing rate of diffusion at 50°C.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
verified

A 55.0-L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

A 1.000 kg sample of nitroglycerine,C₃H₅N₃O₉,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced? 4 C₃H₅N₃O₉(s) → 12 CO₂(g) + 10 H₂O(g) + 6 N₂(g) + O₂(g)

Correct Answer
verified
D

Correct Answer
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What pressure will 2.6 × 10²³ molecules of N₂exert in a 3.9 L container at 45°C?

Correct Answer
verified

A gas mixture contains CO,Ar and H₂.What is the total pressure of the mixture,if the mole fraction of H₂ is 0.350 and the pressure of H₂ is 0.480 atm?

Correct Answer
verified
A

Correct Answer
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Correct Answer
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Correct Answer
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Place the following gases in order of increasing density at STP. F₂ NH₃ N₂O₄ Ar

Correct Answer
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How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg? N₂(g) + 3 H₂(g) → 2 NH₃(g)

Correct Answer
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Correct Answer
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Correct Answer
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Rank the following in order of decreasing rate of effusion. F₂ SF₆ He Ar

Correct Answer
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Correct Answer
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Correct Answer
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