Question 1

A gas bottle contains 0.450 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

Accepted Answer

A)  0.0471 mol 
B)  0.0888 mol 
C)  0.497 mol 
D)  0.539 mol 
A)  0.0471 mol 
B)  0.0888 mol 
C)  0.497 mol 
D)  0.539 mol

Question 2

Determine the volume of SO2 (at STP)formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 atm).The molar mass of FeS2 is 119.99 g/mol. 4 FeS2(s)+ 11 O2(g)→ 2 Fe2O3(s)+ 8 SO2(g)

Accepted Answer

A)  36.1 L 
B)  45.3 L 
C)  18.1 L 
D)  27.6 L 
E)  32.9 L 
A)  36.1 L 
B)  45.3 L 
C)  18.1 L 
D)  27.6 L 
E)  32.9 L

Question 3

Rank the following in order of decreasing rate of effusion. F2 SF6 Ne Kr

Accepted Answer

A)  SF6 > Kr > F2 > Ne 
B)  Kr > Ne > SF6 > F2 
C)  F2 > Kr > Ne > SF6 
D)  Ne > F2 > Kr > SF6 
E)  Ne > F2 > SF6 > Kr 
A)  SF6 > Kr > F2 > Ne 
B)  Kr > Ne > SF6 > F2 
C)  F2 > Kr > Ne > SF6 
D)  Ne > F2 > Kr > SF6 
E)  Ne > F2 > SF6 > Kr

Question 4

The density of chlorine gas at 0.866 atm and 39.9°C is ________ g/L.

Accepted Answer

A)  0.0337 
B)  0.418 
C)  0.264 
D)  1.20 
E)  2.39 
A)  0.0337 
B)  0.418 
C)  0.264 
D)  1.20 
E)  2.39

Question 5

Given the equation C2H6(g)+ O2(g)→ CO2(g)+ H2O(g)(not balanced),determine the number of liters of O2 consumed at STP when 150.0 grams of C2H6 is burned.

Accepted Answer

Question 6

Identify the gas particle that travels the slowest.

Accepted Answer

A)  H2 
B)  Cl2 
C)  Ar 
D)  F2 
E)  Xe 
A)  H2 
B)  Cl2 
C)  Ar 
D)  F2 
E)  Xe

Question 7

Which of the gases in the graph below has the smallest molar mass?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  There is not enough information to determine. 
A)  A 
B)  B 
C)  C 
D)  D 
E)  There is not enough information to determine.

Question 8

In a container containing Ne,H2,and CO2,what is the mole fraction of Ne if the H2 mole fraction is 0.22 and the CO2 mole fraction is 0.58?

Accepted Answer

A)  0.20 
B)  0.30 
C)  0.10 
D)  0.50 
A)  0.20 
B)  0.30 
C)  0.10 
D)  0.50

Question 9

How many moles of CO are contained in a 5.00 L tank at 155°C and 2.80 atm?

Accepted Answer

A)  0.399 moles 
B)  1.10 moles 
C)  2.51 moles 
D)  0.455 moles 
E)  0.289 moles 
A)  0.399 moles 
B)  1.10 moles 
C)  2.51 moles 
D)  0.455 moles 
E)  0.289 moles

Question 10

This equation is used to calculate the properties of a gas under nonideal conditions.

Accepted Answer

A)  Charles's Law 
B)  Avogadro's Law 
C)  Boyle's Law 
D)  van der Waals equation 
E)  Dalton's Law 
A)  Charles's Law 
B)  Avogadro's Law 
C)  Boyle's Law 
D)  van der Waals equation 
E)  Dalton's Law

Question 11

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

Question 12

What is the total pressure in a 10.0-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Accepted Answer

A)  0.306 atm 
B)  0.681 atm 
C)  0.693 atm 
D)  0.998 atm 
E)  3.30 
A)  0.306 atm 
B)  0.681 atm 
C)  0.693 atm 
D)  0.998 atm 
E)  3.30

Question 13

If CO2 and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of CO2.

Accepted Answer

A)  0.39 
B)  0.62 
C)  1.6 
D)  2.6 
A)  0.39 
B)  0.62 
C)  1.6 
D)  2.6

Question 14

A sample of gas initially has a volume of 859 mL at 565 K and 2.20 atm.What pressure will the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?

Accepted Answer

A)  10.2 atm 
B)  9.83 atm 
C)  15.3 atm 
D)  6.53 atm 
E)  1.05 atm 
A)  10.2 atm 
B)  9.83 atm 
C)  15.3 atm 
D)  6.53 atm 
E)  1.05 atm

Question 15

A child receives a helium balloon in a shopping mall.When he goes outside during a snowstorm,the balloon decreases in size.Which gas law is this an example of?

Accepted Answer

A)  Avogadro's Law 
B)  Ideal Gas Law 
C)  Charles's Law 
D)  Boyle's Law 
E)  Dalton's Law 
A)  Avogadro's Law 
B)  Ideal Gas Law 
C)  Charles's Law 
D)  Boyle's Law 
E)  Dalton's Law

Question 16

To avoid oxygen toxicity and nitrogen narcosis,deep-sea divers breathe a specialized mixture of gas.Describe the mixture.

Accepted Answer

A)  hydrogen and oxygen 
B)  nitrogen and oxygen 
C)  helium and oxygen 
D)  argon and helium 
E)  nitrogen and helium 
A)  hydrogen and oxygen 
B)  nitrogen and oxygen 
C)  helium and oxygen 
D)  argon and helium 
E)  nitrogen and helium

Question 17

In weather,high-pressure systems and low-pressure systems typically go from west to east in the United States.What type of weather does this indicate?

Accepted Answer

A)  No weather is indicated by high pressure or low pressure systems. 
B)  Both high pressure and low pressure usually indicate clear weather. 
C)  High pressure usually indicates unstable weather and low pressure usually indicates clear weather. 
D)  Both high pressure and low pressure usually indicates unstable weather. 
E)  High pressure usually indicates clear weather and low pressure usually indicates unstable weather. 
A)  No weather is indicated by high pressure or low pressure systems. 
B)  Both high pressure and low pressure usually indicate clear weather. 
C)  High pressure usually indicates unstable weather and low pressure usually indicates clear weather. 
D)  Both high pressure and low pressure usually indicates unstable weather. 
E)  High pressure usually indicates clear weather and low pressure usually indicates unstable weather.

Question 18

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains   flask B contains O3,and flask C contains N2.Which flask contains the largest number of molecules?

Accepted Answer

A)  flask A 
B)  flask B 
C)  flask C 
D)  All contain same number of molecules. 
A)  flask A 
B)  flask B 
C)  flask C 
D)  All contain same number of molecules.

Question 19

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

Accepted Answer

A)  5.5 atm 
B)  1.7 atm 
C)  2.9 atm 
D)  3.4 atm 
E)  4.6 atm 
A)  5.5 atm 
B)  1.7 atm 
C)  2.9 atm 
D)  3.4 atm 
E)  4.6 atm

Question 20

An instrument used to measure blood pressure is called a

Accepted Answer

A)  barometer. 
B)  manometer. 
C)  sphygmomanometer. 
D)  spectrophotometer. 
E)  spectrometer. 
A)  barometer. 
B)  manometer. 
C)  sphygmomanometer. 
D)  spectrophotometer. 
E)  spectrometer.

Exam 5: Gases

A gas bottle contains 0.450 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

Determine the volume of SO2 (at STP)formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 atm).The molar mass of FeS2 is 119.99 g/mol. 4 FeS2(s)+ 11 O2(g)→ 2 Fe2O3(s)+ 8 SO2(g)

Rank the following in order of decreasing rate of effusion. F2 SF6 Ne Kr

The density of chlorine gas at 0.866 atm and 39.9°C is ________ g/L.

Given the equation C2H6(g)+ O2(g)→ CO2(g)+ H2O(g)(not balanced),determine the number of liters of O2 consumed at STP when 150.0 grams of C2H6 is burned.

Identify the gas particle that travels the slowest.

Which of the gases in the graph below has the smallest molar mass?

In a container containing Ne,H2,and CO2,what is the mole fraction of Ne if the H2 mole fraction is 0.22 and the CO2 mole fraction is 0.58?

How many moles of CO are contained in a 5.00 L tank at 155°C and 2.80 atm?

This equation is used to calculate the properties of a gas under nonideal conditions.

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?

What is the total pressure in a 10.0-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

If CO2 and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of CO2.

A sample of gas initially has a volume of 859 mL at 565 K and 2.20 atm.What pressure will the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?

A child receives a helium balloon in a shopping mall.When he goes outside during a snowstorm,the balloon decreases in size.Which gas law is this an example of?

To avoid oxygen toxicity and nitrogen narcosis,deep-sea divers breathe a specialized mixture of gas.Describe the mixture.

In weather,high-pressure systems and low-pressure systems typically go from west to east in the United States.What type of weather does this indicate?

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains flask B contains O3,and flask C contains N2.Which flask contains the largest number of molecules?

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

An instrument used to measure blood pressure is called a

Matter, measurement, and Problem Solving

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Chemical Quantities and Aqueous Reactions

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Determine the volume of SO₂ (at STP)formed from the reaction of 96.7 g of FeS₂ and 55.0 L of O₂ (at 398 K and 1.20 atm).The molar mass of FeS₂ is 119.99 g/mol. 4 FeS₂(s)+ 11 O₂(g)→ 2 Fe₂O₃(s)+ 8 SO₂(g)

Rank the following in order of decreasing rate of effusion. F₂ SF₆ Ne Kr

Given the equation C₂H₆(g)+ O₂(g)→ CO₂(g)+ H₂O(g)(not balanced),determine the number of liters of O₂ consumed at STP when 150.0 grams of C₂H₆ is burned.

In a container containing Ne,H₂,and CO₂,what is the mole fraction of Ne if the H₂ mole fraction is 0.22 and the CO₂ mole fraction is 0.58?

What is the total pressure in a 10.0-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?

If CO₂ and NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of CO₂.

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains flask B contains O₃,and flask C contains N₂.Which flask contains the largest number of molecules?

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