Question 1

What is the pressure (in atmospheres) of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 735 mmHg and h = 8.3 cm

Accepted Answer

A)  0.858 atm 
B)  0.758 atm 
C)  0.658 atm 
D)  0.558 atm 
E)  None of the above 
A)  0.858 atm 
B)  0.758 atm 
C)  0.658 atm 
D)  0.558 atm 
E)  None of the above

Question 2

A sample of pure oxygen gas has a pressure of 795 torr. What is the pressure of the oxygen in units of atmospheres

Accepted Answer

A)  0.795 atm 
B)  1.05 atm 
C)  0.604 atm 
D)  0.760 atm 
E)  1.01 atm 
A)  0.795 atm 
B)  1.05 atm 
C)  0.604 atm 
D)  0.760 atm 
E)  1.01 atm

Question 3

A sample of a gas occupies 1.40 * 103 mL at 25$\circ$C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg

Accepted Answer

A)  2,800 mL 
B)  2,100 mL 
C)  1,400 mL 
D)  1,050 mL 
E)  700 mL 
A)  2,800 mL 
B)  2,100 mL 
C)  1,400 mL 
D)  1,050 mL 
E)  700 mL

Question 4

A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 L at 22.5$\circ$C and 702 mmHg. How many moles of gas were collected

Accepted Answer

A)  0.95 mol 
B)  1.05 mol 
C)  12.5 mol 
D)  22.4 mol 
E)  724 mol 
A)  0.95 mol 
B)  1.05 mol 
C)  12.5 mol 
D)  22.4 mol 
E)  724 mol

Question 5

A 45 mL sample of nitrogen gas is cooled from 135ºC to 15$\circ$C in a container that can contract or expand at constant pressure. What is the new volume of the nitrogen gas

Accepted Answer

A)  64 mL 
B)  5.0 mL 
C)  410 mL 
D)  32 mL 
E)  41 mL 
A)  64 mL 
B)  5.0 mL 
C)  410 mL 
D)  32 mL 
E)  41 mL

Question 6

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133$\circ$C and 0.880 atm (The other reaction product is solid KCl.)

Accepted Answer

A)  24.6 g 
B)  70.8 g 
C)  272 g 
D)  408 g 
E)  612 g 
A)  24.6 g 
B)  70.8 g 
C)  272 g 
D)  408 g 
E)  612 g

Question 7

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97$\circ$C. The pressure of the chloroform is 728 mmHg.

Accepted Answer

A)  8.28 * 10-3 g/mol 
B)  31.6 g/mol 
C)  112 g/mol 
D)  121g/mol 
E)  187g/mol 
A)  8.28 * 10-3 g/mol 
B)  31.6 g/mol 
C)  112 g/mol 
D)  121g/mol 
E)  187g/mol

Question 8

At what temperature will a sample of oxygen gas with a volume of 0.110 L at 12$\circ$C and 822 mmHg occupy a volume of 345 mL at a pressure of 578 mm Hg Assume the amount of the oxygen gas does not change.

Accepted Answer

A)  129$\circ$C 
B)  355$\circ$C 
C)  402$\circ$C 
D)  629$\circ$C 
E)  903$\circ$C 
A)  129$\circ$C 
B)  355$\circ$C 
C)  402$\circ$C 
D)  629$\circ$C 
E)  903$\circ$C

Question 9

How many atoms of He gas are present in a 450 mL container at 35$\circ$C and 740 mmHg

Accepted Answer

A)  0.017 He atoms 
B)  0.068 He atoms 
C)  1.2 x 105 He atoms 
D)  1.0 x 1022 He atoms 
E)  7.9 x 1024 He atoms 
A)  0.017 He atoms 
B)  0.068 He atoms 
C)  1.2 x 105 He atoms 
D)  1.0 x 1022 He atoms 
E)  7.9 x 1024 He atoms

Question 10

A 1.07 g sample of a Noble gas occupies a volume of 363 mL at 35$\circ$C and 678 mmHg. Identify the Noble gas in this sample. (R = 0.08206 L*atm/K*mol)

Accepted Answer

A)  He 
B)  Ne 
C)  Ar 
D)  Kr 
E)  Xe 
A)  He 
B)  Ne 
C)  Ar 
D)  Kr 
E)  Xe

Question 11

A sample of helium gas occupies 355mL at 23$\circ$C. If the container the He is in is expanded to 1.50 L at constant pressure, what is the final temperature for the He at this new volume

Accepted Answer

A)  1,250$\circ$C 
B)  978$\circ$C 
C)  70.1$\circ$C 
D)  80.0$\circ$C 
E)  1,520$\circ$C 
A)  1,250$\circ$C 
B)  978$\circ$C 
C)  70.1$\circ$C 
D)  80.0$\circ$C 
E)  1,520$\circ$C

Question 12

1.000 atm of dry nitrogen, placed in a container having a pinhole opening in its side, leaks from the container 3.55 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of these species could be the unknown gas

Accepted Answer

A)  NH3 
B)  C4H10 
C)  SF6 
D)  UF6 
E)  Rn 
A)  NH3 
B)  C4H10 
C)  SF6 
D)  UF6 
E)  Rn

Question 13

What is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg ?

Accepted Answer

A)  12 mmHg 
B)  708 mmHg 
C)  720 mmHg 
D)  732 mmHg 
E)  760 mmHg 
A)  12 mmHg 
B)  708 mmHg 
C)  720 mmHg 
D)  732 mmHg 
E)  760 mmHg

Question 14

Calculate the density of SO2 gas, in grams per liter, at 55$\circ$C and 1.5 atm.

Accepted Answer

A)  3.2 g/L 
B)  3.4g/L 
C)  3.6 g/L 
D)  3.8g/L 
E)  None of the above 
A)  3.2 g/L 
B)  3.4g/L 
C)  3.6 g/L 
D)  3.8g/L 
E)  None of the above

Question 15

Many automobiles produce about 5 grams of NO for each mile they are driven. How many liters of NO gas at STP would be produced on a 100-mile trip

Accepted Answer

A)  400 liters of NO 
B)  500 liters of NO 
C)  600 liters of NO 
D)  700 liters of NO 
E)  None of the above 
A)  400 liters of NO 
B)  500 liters of NO 
C)  600 liters of NO 
D)  700 liters of NO 
E)  None of the above

Question 16

Gas A and gas B are combined in a flask at initial pressures of 1.0 atm each. The flask is sealed and over time they react to completion to give gas C according to the following chemical equation: 2A(g) + B(g) $\rarr$ C(g)
Assuming the temperature stays constant, what will be the total pressure in the flask after the reaction goes to completion

Accepted Answer

A)  0.33 atm 
B)  0.50 atm 
C)  0.67 atm 
D)  0.75 atm 
E)  1.0 atm 
A)  0.33 atm 
B)  0.50 atm 
C)  0.67 atm 
D)  0.75 atm 
E)  1.0 atm

Question 17

What is the pressure (mmHg) of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 742 mmHg and h = 16.7 cm

Accepted Answer

A)  375 mmHg 
B)  475 mmHg 
C)  575 mmHg 
D)  675 mmHg 
E)  None of the Above 
A)  375 mmHg 
B)  475 mmHg 
C)  575 mmHg 
D)  675 mmHg 
E)  None of the Above

Question 18

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.0$\circ$C. Which of these choices is its molecular formula

Accepted Answer

A)  NO 
B)  NO2 
C)  N3O6 
D)  N2O4 
E)  N2O5 
A)  NO 
B)  NO2 
C)  N3O6 
D)  N2O4 
E)  N2O5

Question 19

Gasoline (which can be considered to be octane, C8H18) burns in oxygen to produce carbon dioxide and water. What volume (L) of carbon dioxide at STP is generated as a result of the combustion of 1.0 gal of gasoline
(The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Accepted Answer

A)  4800 L 
B)  4700 L 
C)  4600 L 
D)  4500 L 
E)  None of the above 
A)  4800 L 
B)  4700 L 
C)  4600 L 
D)  4500 L 
E)  None of the above

Question 20

Ammonium nitrite undergoes decomposition to produce only gases as shown below.NH4NO2(s) $\rarr$ N2(g) + 2H2O(g) How many liters of gas will be produced by the decomposition of 32.0 g of NH4NO2 at 525$\circ$C and 1.5 atm

Accepted Answer

A)  45 L 
B)  55 L 
C)  65 L 
D)  75 L 
E)  None of the above 
A)  45 L 
B)  55 L 
C)  65 L 
D)  75 L 
E)  None of the above

Exam 5: Gases

What is the pressure (in atmospheres) of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 735 mmHg and h = 8.3 cm

A sample of pure oxygen gas has a pressure of 795 torr. What is the pressure of the oxygen in units of atmospheres

A sample of a gas occupies 1.40 * 103 mL at 25 ∘\circ∘ C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg

A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 L at 22.5 ∘\circ∘ C and 702 mmHg. How many moles of gas were collected

A 45 mL sample of nitrogen gas is cooled from 135ºC to 15 ∘\circ∘ C in a container that can contract or expand at constant pressure. What is the new volume of the nitrogen gas

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133 ∘\circ∘ C and 0.880 atm (The other reaction product is solid KCl.)

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97 ∘\circ∘ C. The pressure of the chloroform is 728 mmHg.

At what temperature will a sample of oxygen gas with a volume of 0.110 L at 12 ∘\circ∘ C and 822 mmHg occupy a volume of 345 mL at a pressure of 578 mm Hg Assume the amount of the oxygen gas does not change.

How many atoms of He gas are present in a 450 mL container at 35 ∘\circ∘ C and 740 mmHg

A 1.07 g sample of a Noble gas occupies a volume of 363 mL at 35 ∘\circ∘ C and 678 mmHg. Identify the Noble gas in this sample. (R = 0.08206 L*atm/K*mol)

A sample of helium gas occupies 355mL at 23 ∘\circ∘ C. If the container the He is in is expanded to 1.50 L at constant pressure, what is the final temperature for the He at this new volume

1.000 atm of dry nitrogen, placed in a container having a pinhole opening in its side, leaks from the container 3.55 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of these species could be the unknown gas

What is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg ?

Calculate the density of SO2 gas, in grams per liter, at 55 ∘\circ∘ C and 1.5 atm.

Many automobiles produce about 5 grams of NO for each mile they are driven. How many liters of NO gas at STP would be produced on a 100-mile trip

What is the pressure (mmHg) of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 742 mmHg and h = 16.7 cm

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.0 ∘\circ∘ C. Which of these choices is its molecular formula

Gasoline (which can be considered to be octane, C8H18) burns in oxygen to produce carbon dioxide and water. What volume (L) of carbon dioxide at STP is generated as a result of the combustion of 1.0 gal of gasoline (The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Ammonium nitrite undergoes decomposition to produce only gases as shown below.NH4NO2(s) →\rarr→ N2(g) + 2H2O(g) How many liters of gas will be produced by the decomposition of 32.0 g of NH4NO2 at 525 ∘\circ∘ C and 1.5 atm

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Hybridization of Atomic

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

A sample of a gas occupies 1.40 * 10³ mL at 25^$\circ$C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg

A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 L at 22.5^$\circ$C and 702 mmHg. How many moles of gas were collected

A 45 mL sample of nitrogen gas is cooled from 135ºC to 15^$\circ$C in a container that can contract or expand at constant pressure. What is the new volume of the nitrogen gas

What mass of KClO₃ must be decomposed to produce 126 L of oxygen gas at 133^$\circ$C and 0.880 atm (The other reaction product is solid KCl.)

Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97^$\circ$C. The pressure of the chloroform is 728 mmHg.

At what temperature will a sample of oxygen gas with a volume of 0.110 L at 12^$\circ$C and 822 mmHg occupy a volume of 345 mL at a pressure of 578 mm Hg Assume the amount of the oxygen gas does not change.

How many atoms of He gas are present in a 450 mL container at 35^$\circ$C and 740 mmHg

A 1.07 g sample of a Noble gas occupies a volume of 363 mL at 35^$\circ$C and 678 mmHg. Identify the Noble gas in this sample. (R = 0.08206 Latm/Kmol)

A sample of helium gas occupies 355mL at 23^$\circ$C. If the container the He is in is expanded to 1.50 L at constant pressure, what is the final temperature for the He at this new volume

Calculate the density of SO₂ gas, in grams per liter, at 55^$\circ$C and 1.5 atm.

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.0^$\circ$C. Which of these choices is its molecular formula

Gasoline (which can be considered to be octane, C₈H₁₈) burns in oxygen to produce carbon dioxide and water. What volume (L) of carbon dioxide at STP is generated as a result of the combustion of 1.0 gal of gasoline (The density of gasoline is 0.81 g/mL. 1 gal = 3.78 L)

Ammonium nitrite undergoes decomposition to produce only gases as shown below.NH₄NO₂(s) $\rarr$ N₂(g) + 2H₂O(g) How many liters of gas will be produced by the decomposition of 32.0 g of NH₄NO₂ at 525^$\circ$C and 1.5 atm