Question 1

The pressure of O2 in a 15.0 L flask is 322 mm Hg at 44 °C.What mass of O2 is in the flask? (R = 0.08206 L⋅atm/mol⋅K)

Accepted Answer

A)   0.244 g
B)   5.80 g
C)   7.82 g
D)   15.2 g
E)   56.3 gF) C) and E)
G) B) and D)

Question 2

Which of the following is the largest value of pressure?

Accepted Answer

A)   72539 Pa
B)   485 mm Hg
C)   12.6 psi
D)   0.677 atm
E)   14.9 in HgF) C) and D)
G) A) and C)

Question 3

A certain person has a body temperature of 309 K.On a cold day,what volume of air at 276 K must this person with a lung capacity of 3.1 L breathe in to fill his lungs?

Accepted Answer

A)   3.47 L
B)   2.77 L
C)   2.92 L
D)   5.54 L
E)   none of theseF) B) and D)
G) A) and E)

Question 4

How long will it take 10.0 mL of Ne gas to effuse through a porous barrier if it has been observed that 125 minutes are required for 10.0 mL of Ar gas to effuse through the same barrier?

Accepted Answer

A)   1.41 min.
B)   31.9 min.
C)   63.1 min.
D)   88.8 min.
E)   176 min.F) C) and D)
G) D) and E)

Question 5

What volume of O2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K)  2 KClO3(s) → 2 KCl(s) + 3 O2(g)

Accepted Answer

A)   2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K)  2 KClO3(s) → 2 KCl(s) + 3 O2(g)  
A)     mL 
B)     mL 
C)     mL 
D)     mL 
E)   none of these" class="answers-bank-image d-inline" rel="preload" > mL
B)   2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K)  2 KClO3(s) → 2 KCl(s) + 3 O2(g)  
A)     mL 
B)     mL 
C)     mL 
D)     mL 
E)   none of these" class="answers-bank-image d-inline" rel="preload" > mL
C)   2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K)  2 KClO3(s) → 2 KCl(s) + 3 O2(g)  
A)     mL 
B)     mL 
C)     mL 
D)     mL 
E)   none of these" class="answers-bank-image d-inline" rel="preload" > mL
D)   2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K)  2 KClO3(s) → 2 KCl(s) + 3 O2(g)  
A)     mL 
B)     mL 
C)     mL 
D)     mL 
E)   none of these" class="answers-bank-image d-inline" rel="preload" > mL
E)   none of theseF) None of the above
G) A) and D)

Question 6

A statement of Avogadro's hypothesis is that equal volumes of gases under the same conditions of pressure and temperature will contain equal numbers of ________.

Accepted Answer

particles ...

Question 7

A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO2 has a total pressure of 8.4 atm.What is the partial pressure of CO2?

Accepted Answer

A)   3 atm
B)   2 atm
C)   25 atm
D)   6 atm
E)   8 atmF) C) and D)
G) D) and E)

Question 8

What is the final volume of nitrogen gas if the pressure of 5.8 L of the gas is decreased to one-half of its original pressure,and its absolute temperature is increased to double the original temperature?

Accepted Answer

A)   2.9 L
B)   5.8 L
C)   12 L
D)   23 L
E)   1.5 LF) C) and D)
G) B) and D)

Question 9

What volume of gaseous silane,SiH4,has the same moles of gas as 9.00 L of helium gas at the same temperature and pressure?

Accepted Answer

A)   54.0 L
B)   1.50 L
C)   9.00 L
D)   1.80 L
E)   45.0 LF) B) and E)
G) None of the above

Question 10

According to Dalton's laws of partial pressures,which of the following is correct?

Accepted Answer

A)   Ptotal = PA + PB + PC…
B)   Ptotal = PA - PB - PC …
C)   Ptotal = R (T1 + T 2 + T 3 ….) 
D)   PV = nRT
E)   P1/T1 = P2/T2F) D) and E)
G) A) and D)

Question 11

Real gases are those that

Accepted Answer

A)   only behave ideally at high pressures or low temperatures
B)   deviate from ideal behavior
C)   are only available naturally in the earth's atmosphere
D)   are called real gases because their behavior can easily be modeled
E)   have an even number of protonsF) C) and D)
G) B) and E)

Question 12

A sample of methane,CH4,occupies a volume of 230.0 mL at 25°C and exerts a pressure of 900.0 mmHg.If the volume of the gas is allowed to expand to 680.0 mL at 298 K,what will be the pressure of the gas?

Accepted Answer

A)   2660 mmHg
B)   3630 mmHg
C)   304.4 mmHg
D)   0.01113 mmHg
E)   450.0 mmHgF) C) and D)
G) A) and E)

Question 13

If 0.357 g of CH4 gas is introduced into an empty 1.75 L flask at 25 °C,what will be the pressure inside the flask? (R = 0.08206 L⋅atm/mol⋅K)

Accepted Answer

A)   0.952 atm
B)   0.261 atm
C)   0.311 atm
D)   0.419 atm
E)   4.99 atmF) B) and D)
G) A) and E)

Question 14

A 10.0 L flask at 318 K contains a mixture of Ar and CH4 with a total pressure of 1.040 atm.If the mole fraction of Ar is 0.715,what is the mass percent of Ar?

Accepted Answer

A)   13.8%
B)   68.8%
C)   71.5%
D)   82.9%
E)   86.2%F) A) and B)
G) A) and C)

Question 15

What is the volume occupied by a mixture of 0.329 mol of N2 gas and 0.329 mol of O2 gases at 0.83 atm and 23.2°C?

Accepted Answer

A)   5.79 × 102 L
B)   19.3 L
C)   0.755 L
D)   1.51 L
E)   9.65 LF) B) and C)
G) A) and E)

Question 16

What volume does 49.0 g of N2 gas occupy at STP? (R = 0.08206 L⋅atm/mol⋅K)

Accepted Answer

A)   78 L
B)   2 L
C)   39 L
D)   61 L
E)   None of theseF) D) and E)
G) A) and B)

Question 17

The ideal gas law can be modified to correct for the errors arising from nonideality.The modified equation is known as the ________ equation of state for a real gas.

Accepted Answer

The answer of The ideal gas law can be modified...

Question 18

What volume is occupied by 35.0 g of C2H2 at 471 mm Hg and 21 °C? (R = 0.08206 L⋅atm/mol⋅K)

Accepted Answer

A)   29.0 L
B)   52.3 L
C)   3.74 L
D)   20.1 L
E)   0.0689 LF) B) and C)
G) C) and E)

Question 19

The partial pressures of CH4,N2,and O2 in a sample of a gas mixture were found to be 191 mm Hg,451 mm Hg,and 583 mm Hg,respectively.Calculate the mole fraction of nitrogen.

Accepted Answer

A)   1
B)   0.
C)   20.8
D)   0..
E)   0F) A) and D)
G) A) and C)

Question 20

The density of a gas is 1.25 g/L at STP.What is its molar mass?

Accepted Answer

A)   25.0 g/mol
B)   37.6 g/mol
C)   17.9 g/mol
D)   22.4 g/mol
E)   28.0 g/molF) D) and E)
G) B) and D)

Exam 11: Gases and Their Properties

A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO2 has a total pressure of 8.4 atm.What is the partial pressure of CO2?

Correct AnswerverifiedShow Answer

What volume of O2,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO3? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K) 2 KClO3(s) → 2 KCl(s) + 3 O2(g)

Correct AnswerverifiedShow Answer

A 10.0 L flask at 318 K contains a mixture of Ar and CH4 with a total pressure of 1.040 atm.If the mole fraction of Ar is 0.715,what is the mass percent of Ar?

Correct AnswerverifiedShow Answer

What is the volume occupied by a mixture of 0.329 mol of N2 gas and 0.329 mol of O2 gases at 0.83 atm and 23.2°C?

Correct AnswerverifiedShow Answer

The ideal gas law can be modified to correct for the errors arising from nonideality.The modified equation is known as the ________ equation of state for a real gas.

Correct AnswerverifiedShow Answer

A certain person has a body temperature of 309 K.On a cold day,what volume of air at 276 K must this person with a lung capacity of 3.1 L breathe in to fill his lungs?

Correct AnswerverifiedShow Answer

What is the final volume of nitrogen gas if the pressure of 5.8 L of the gas is decreased to one-half of its original pressure,and its absolute temperature is increased to double the original temperature?

Correct AnswerverifiedShow Answer

Real gases are those that

Correct AnswerverifiedShow Answer

If 0.357 g of CH4 gas is introduced into an empty 1.75 L flask at 25 °C,what will be the pressure inside the flask? (R = 0.08206 L⋅atm/mol⋅K)

Correct AnswerverifiedShow Answer

A statement of Avogadro's hypothesis is that equal volumes of gases under the same conditions of pressure and temperature will contain equal numbers of ________.

Correct Answerverifiedparticles ...View AnswerShow Answer

According to Dalton's laws of partial pressures,which of the following is correct?

Correct AnswerverifiedShow Answer

How long will it take 10.0 mL of Ne gas to effuse through a porous barrier if it has been observed that 125 minutes are required for 10.0 mL of Ar gas to effuse through the same barrier?

Correct AnswerverifiedShow Answer

Which of the following is the largest value of pressure?

Correct AnswerverifiedShow Answer

A sample of methane,CH4,occupies a volume of 230.0 mL at 25°C and exerts a pressure of 900.0 mmHg.If the volume of the gas is allowed to expand to 680.0 mL at 298 K,what will be the pressure of the gas?

Correct AnswerverifiedShow Answer

The density of a gas is 1.25 g/L at STP.What is its molar mass?

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The pressure of O2 in a 15.0 L flask is 322 mm Hg at 44 °C.What mass of O2 is in the flask? (R = 0.08206 L⋅atm/mol⋅K)

Correct AnswerverifiedShow Answer

What volume is occupied by 35.0 g of C2H2 at 471 mm Hg and 21 °C? (R = 0.08206 L⋅atm/mol⋅K)

Correct AnswerverifiedShow Answer

What volume does 49.0 g of N2 gas occupy at STP? (R = 0.08206 L⋅atm/mol⋅K)

Correct AnswerverifiedShow Answer

The partial pressures of CH4,N2,and O2 in a sample of a gas mixture were found to be 191 mm Hg,451 mm Hg,and 583 mm Hg,respectively.Calculate the mole fraction of nitrogen.

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What volume of gaseous silane,SiH4,has the same moles of gas as 9.00 L of helium gas at the same temperature and pressure?

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A gaseous mixture containing 1.5 mol Ar and 3.5 mol CO₂ has a total pressure of 8.4 atm.What is the partial pressure of CO₂?

Correct Answer
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What volume of O₂,measured at 24.0°C and 0.882 atm atm,will be produced by the decomposition of 3.00 g KClO₃? Assume 100% yield.(R = 0.08206 L⋅atm/mol⋅K) 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g)

Correct Answer
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A 10.0 L flask at 318 K contains a mixture of Ar and CH₄ with a total pressure of 1.040 atm.If the mole fraction of Ar is 0.715,what is the mass percent of Ar?

Correct Answer
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What is the volume occupied by a mixture of 0.329 mol of N₂ gas and 0.329 mol of O₂ gases at 0.83 atm and 23.2°C?

Correct Answer
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Correct Answer
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If 0.357 g of CH₄ gas is introduced into an empty 1.75 L flask at 25 °C,what will be the pressure inside the flask? (R = 0.08206 L⋅atm/mol⋅K)

Correct Answer
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Correct Answer
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particles ...
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A sample of methane,CH₄,occupies a volume of 230.0 mL at 25°C and exerts a pressure of 900.0 mmHg.If the volume of the gas is allowed to expand to 680.0 mL at 298 K,what will be the pressure of the gas?

Correct Answer
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Correct Answer
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The pressure of O₂ in a 15.0 L flask is 322 mm Hg at 44 °C.What mass of O₂ is in the flask? (R = 0.08206 L⋅atm/mol⋅K)

Correct Answer
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What volume is occupied by 35.0 g of C₂H₂ at 471 mm Hg and 21 °C? (R = 0.08206 L⋅atm/mol⋅K)

Correct Answer
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What volume does 49.0 g of N₂ gas occupy at STP? (R = 0.08206 L⋅atm/mol⋅K)

Correct Answer
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The partial pressures of CH₄,N₂,and O₂ in a sample of a gas mixture were found to be 191 mm Hg,451 mm Hg,and 583 mm Hg,respectively.Calculate the mole fraction of nitrogen.

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What volume of gaseous silane,SiH₄,has the same moles of gas as 9.00 L of helium gas at the same temperature and pressure?

Correct Answer
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