Question 1

If 2.00 moles of an ideal gas at STP is subjected to a new pressure of 24.7 kPa,the volume of the gas will become

Accepted Answer

A) 8.20 L 
B) 22.4 L 
C) 11.2 L 
D) 184 L 
E) 91.9 L 
A) 8.20 L 
B) 22.4 L 
C) 11.2 L 
D) 184 L 
E) 91.9 L

Question 2

Which of the following gases would you predict to have the largest value of the van der Waals coefficient b?

Accepted Answer

A) C2F2Cl2  
B) C2FCl5  
C) C2F4  
D) Cl2  
E) F2 
A) C2F2Cl2  
B) C2FCl5  
C) C2F4  
D) Cl2  
E) F2

Question 3

How many atoms of argon occupy 20.00 mL if the temperature is 200°C and the pressure is 2.00 × 10-3 Torr?

Accepted Answer

A) 2.01 * 1017  
B) 6.02 * 10-17  
C) 3.10 * 1017  
D) 2.44 * 1019  
E) 2.80 * 10-11  
A) 2.01 * 1017  
B) 6.02 * 10-17  
C) 3.10 * 1017  
D) 2.44 * 1019  
E) 2.80 * 10-11

Question 4

Calcium cyanamide reacts with H2O(g)at 150S1U1P1$\circ$S1S1P0C and 1.00 atm pressure: CaNCN(s)+ 3H2O(g)$\rightarrow$ CaCO3(s)+ 2NH3(g)
If 80.0 L of NH3(g)are produced,what volume of steam is required?

Accepted Answer

A) 40.0 L 
B) 80.0 L 
C) 26.7 L 
D) 120.L 
E) 240.L 
A) 40.0 L 
B) 80.0 L 
C) 26.7 L 
D) 120.L 
E) 240.L

Question 5

The empirical formula of a gas is CH3O.If 2.77 g of the gas occupies 1.00 L at exactly 0S1U1P1$\circ$S1S1P0C at a pressure of 760 Torr,what is the molecular formula of the gas?

Accepted Answer

A) C4H12O4  
B) C2H6O2  
C) C5H15O5  
D) CH3O 
E) C3H9O3  
A) C4H12O4  
B) C2H6O2  
C) C5H15O5  
D) CH3O 
E) C3H9O3

Question 6

Consider the following reaction: 4KO2(s)+ 2CO2(g)$\rightarrow$2K2CO3(s)+ 3O2(g)
How many moles of KO2 are needed to react with 75.0 L of carbon dioxide at -25S1U1P1$\circ$S1S1P0C and 215 kPa?

Accepted Answer

A) 3.91 
B) 7.82 
C) 31.3 
D) 23.5 
E) 15.6 
A) 3.91 
B) 7.82 
C) 31.3 
D) 23.5 
E) 15.6

Question 7

The value of the gas law constant,R,in units of m3.Pa.mol-1.K-1 is

Accepted Answer

A) 8.31 
B) 0.0821 
C) 7.62 
D) 0.0752 
E) 62.4 
A) 8.31 
B) 0.0821 
C) 7.62 
D) 0.0752 
E) 62.4

Question 8

The following experiment was carried out using a newly synthesized chlorofluorocarbon.Exactly 50 mL of the gas effused through a porous barrier in 172 s.The same volume of argon effused in 76 s under the same conditions.Which compound is the chlorofluorocarbon?

Accepted Answer

A) C2Cl2F4  
B) C2Cl4F2  
C) C2Cl3F3  
D) C2Cl5F 
E) C2ClF5  
A) C2Cl2F4  
B) C2Cl4F2  
C) C2Cl3F3  
D) C2Cl5F 
E) C2ClF5

Question 9

Under what conditions do real gases act least like ideal gases?

Accepted Answer

A) High temperatures and low pressures. 
B) High pressures and low molar masses. 
C) Low temperatures and high pressures. 
D) High temperatures and high pressures. 
E) Low temperatures and low pressures. 
A) High temperatures and low pressures. 
B) High pressures and low molar masses. 
C) Low temperatures and high pressures. 
D) High temperatures and high pressures. 
E) Low temperatures and low pressures.

Question 10

Ideal gases and real gases behave most similarly under which of the following conditions?

Accepted Answer

A) Low temperatures and low pressures. 
B) Low temperatures and high pressures. 
C) High pressures and low molar masses. 
D) High temperatures and high pressures. 
E) High temperatures and low pressures. 
A) Low temperatures and low pressures. 
B) Low temperatures and high pressures. 
C) High pressures and low molar masses. 
D) High temperatures and high pressures. 
E) High temperatures and low pressures.

Question 11

Calculate the density of camphor,C10H16O,at 80S1U1P1$\circ$S1S1P0C and 12 Torr.

Accepted Answer

A) 8.2 * 10-4 g.L-1  
B) 0.083 g.L-1  
C) 0.37 g.L-1  
D) 0.62 g.L-1  
E) 6.8 * 10-3 g.L-1  
A) 8.2 * 10-4 g.L-1  
B) 0.083 g.L-1  
C) 0.37 g.L-1  
D) 0.62 g.L-1  
E) 6.8 * 10-3 g.L-1

Question 12

Calculate the mass of sulfur hexafluoride in a 2.00 L container at a pressure of 4.00 atm and a temperature of 78.0S1U1P1$\circ$S1S1P0C.The molar mass of sulfur hexafluoride is 146.1 g.mol-1.

Accepted Answer

A) 0.401 g 
B) 40.6 g 
C) 73.1 g 
D) 36.6 g 
E) 183 g 
A) 0.401 g 
B) 40.6 g 
C) 73.1 g 
D) 36.6 g 
E) 183 g

Question 13

Which gas is most dense at 1 atm and 25S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) Hydrogen cyanide 
B) Hydrogen sulfide 
C) Nitrogen monoxide 
D) Carbon monoxide 
E) Nitrogen dioxide 
A) Hydrogen cyanide 
B) Hydrogen sulfide 
C) Nitrogen monoxide 
D) Carbon monoxide 
E) Nitrogen dioxide

Question 14

Calculate the mass of oxygen gas required to occupy a volume of 6.00 L at a pressure of 20.9 kPa and a temperature of 37.0S1U1P1$\circ$S1S1P0C.

Accepted Answer

A) 1.56 g 
B) 0.408 g 
C) 0.779 g 
D) 13.1 g 
E) 0.0487 g 
A) 1.56 g 
B) 0.408 g 
C) 0.779 g 
D) 13.1 g 
E) 0.0487 g

Question 15

Helium,H2,and neon all have very small values of the van der Waals coefficient "a",whereas Cl2,xenon,and water have large values.Which gases would you expect to be able to be liquefied by expansion?

Accepted Answer

Question 16

A plot of the Maxwell distribution for the same gas against temperature shows that

Accepted Answer

A) at high temperatures,most molecules have speeds close to their average speed. 
B) as the temperature increases,a high proportion of molecules have very slow speeds. 
C) as the temperature decreases,the spread of speeds widens. 
D) as the temperature decreases,a high proportion of molecules have very high speeds. 
E) at low temperatures,most molecules have speeds close to their average speed. 
A) at high temperatures,most molecules have speeds close to their average speed. 
B) as the temperature increases,a high proportion of molecules have very slow speeds. 
C) as the temperature decreases,the spread of speeds widens. 
D) as the temperature decreases,a high proportion of molecules have very high speeds. 
E) at low temperatures,most molecules have speeds close to their average speed.

Question 17

Which of the following gases would not be expected to cool as it expands?

Accepted Answer

A) NH3  
B) Cl2  
C) Xe 
D) H2O 
E) He 
A) NH3  
B) Cl2  
C) Xe 
D) H2O 
E) He

Question 18

If the average speed of a water molecule at 25S1U1P1$\circ$S1S1P0C is 640 m.s-1 ,what is the average speed at 100S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) 572 m.s-1  
B) 5120 m.s-1  
C) 801 m.s-1  
D) 320 m.s-1  
E) 1280 m.s-1  
A) 572 m.s-1  
B) 5120 m.s-1  
C) 801 m.s-1  
D) 320 m.s-1  
E) 1280 m.s-1

Question 19

Which gas is least dense at 1 atm and 25S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) Hydrogen cyanide 
B) Hydrogen sulfide 
C) Carbon dioxide 
D) Nitrogen 
E) Ammonia 
A) Hydrogen cyanide 
B) Hydrogen sulfide 
C) Carbon dioxide 
D) Nitrogen 
E) Ammonia

Question 20

What volume is occupied by 1.00 kg of helium at 5.00S1U1P1$\circ$S1S1P0C at a pressure of 735 Torr?

Accepted Answer

A) 5.97 * 105 L 
B) 5.90 * 103 L 
C) 2.95 * 103 L 
D) 1.06 * 102 L 
E) 5.60 * 103 L 
A) 5.97 * 105 L 
B) 5.90 * 103 L 
C) 2.95 * 103 L 
D) 1.06 * 102 L 
E) 5.60 * 103 L

If 2.00 moles of an ideal gas at STP is subjected to a new pressure of 24.7 kPa,the volume of the gas will become

Which of the following gases would you predict to have the largest value of the van der Waals coefficient b?

How many atoms of argon occupy 20.00 mL if the temperature is 200°C and the pressure is 2.00 × 10-3 Torr?

Calcium cyanamide reacts with H₂O(g)at 150^$\circ$C and 1.00 atm pressure: CaNCN(s)+ 3H₂O(g) $\rightarrow$ CaCO₃(s)+ 2NH₃(g) If 80.0 L of NH₃(g)are produced,what volume of steam is required?

The empirical formula of a gas is CH₃O.If 2.77 g of the gas occupies 1.00 L at exactly 0^$\circ$C at a pressure of 760 Torr,what is the molecular formula of the gas?

Consider the following reaction: 4KO₂(s)+ 2CO₂(g) $\rightarrow$ 2K₂CO₃(s)+ 3O₂(g) How many moles of KO₂ are needed to react with 75.0 L of carbon dioxide at -25^$\circ$C and 215 kPa?

The value of the gas law constant,R,in units of m³.Pa.mol^-¹.K^-¹ is

The following experiment was carried out using a newly synthesized chlorofluorocarbon.Exactly 50 mL of the gas effused through a porous barrier in 172 s.The same volume of argon effused in 76 s under the same conditions.Which compound is the chlorofluorocarbon?

Under what conditions do real gases act least like ideal gases?

Ideal gases and real gases behave most similarly under which of the following conditions?

Calculate the density of camphor,C₁₀H₁₆O,at 80^$\circ$C and 12 Torr.

Calculate the mass of sulfur hexafluoride in a 2.00 L container at a pressure of 4.00 atm and a temperature of 78.0^$\circ$C.The molar mass of sulfur hexafluoride is 146.1 g.mol^-¹.

Which gas is most dense at 1 atm and 25^$\circ$C?

Calculate the mass of oxygen gas required to occupy a volume of 6.00 L at a pressure of 20.9 kPa and a temperature of 37.0^$\circ$C.

Helium,H₂,and neon all have very small values of the van der Waals coefficient "a",whereas Cl₂,xenon,and water have large values.Which gases would you expect to be able to be liquefied by expansion?

A plot of the Maxwell distribution for the same gas against temperature shows that

Which of the following gases would not be expected to cool as it expands?

If the average speed of a water molecule at 25^$\circ$C is 640 m.s^-1,what is the average speed at 100^$\circ$C?

Which gas is least dense at 1 atm and 25^$\circ$C?

What volume is occupied by 1.00 kg of helium at 5.00^$\circ$C at a pressure of 735 Torr?

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

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Exam 5: The Properties of Gases

If 2.00 moles of an ideal gas at STP is subjected to a new pressure of 24.7 kPa,the volume of the gas will become

Which of the following gases would you predict to have the largest value of the van der Waals coefficient b?

How many atoms of argon occupy 20.00 mL if the temperature is 200°C and the pressure is 2.00 × 10-3 Torr?

Calcium cyanamide reacts with H2O(g)at 150 ∘\circ∘ C and 1.00 atm pressure: CaNCN(s)+ 3H2O(g) →\rightarrow→ CaCO3(s)+ 2NH3(g) If 80.0 L of NH3(g)are produced,what volume of steam is required?

The empirical formula of a gas is CH3O.If 2.77 g of the gas occupies 1.00 L at exactly 0 ∘\circ∘ C at a pressure of 760 Torr,what is the molecular formula of the gas?

Consider the following reaction: 4KO2(s)+ 2CO2(g) →\rightarrow→ 2K2CO3(s)+ 3O2(g) How many moles of KO2 are needed to react with 75.0 L of carbon dioxide at -25 ∘\circ∘ C and 215 kPa?

The value of the gas law constant,R,in units of m3.Pa.mol-1.K-1 is

The following experiment was carried out using a newly synthesized chlorofluorocarbon.Exactly 50 mL of the gas effused through a porous barrier in 172 s.The same volume of argon effused in 76 s under the same conditions.Which compound is the chlorofluorocarbon?

Under what conditions do real gases act least like ideal gases?

Ideal gases and real gases behave most similarly under which of the following conditions?

Calculate the density of camphor,C10H16O,at 80 ∘\circ∘ C and 12 Torr.

Calculate the mass of sulfur hexafluoride in a 2.00 L container at a pressure of 4.00 atm and a temperature of 78.0 ∘\circ∘ C.The molar mass of sulfur hexafluoride is 146.1 g.mol-1.

Which gas is most dense at 1 atm and 25 ∘\circ∘ C?

Calculate the mass of oxygen gas required to occupy a volume of 6.00 L at a pressure of 20.9 kPa and a temperature of 37.0 ∘\circ∘ C.

Helium,H2,and neon all have very small values of the van der Waals coefficient "a",whereas Cl2,xenon,and water have large values.Which gases would you expect to be able to be liquefied by expansion?

A plot of the Maxwell distribution for the same gas against temperature shows that

Which of the following gases would not be expected to cool as it expands?

If the average speed of a water molecule at 25 ∘\circ∘ C is 640 m.s-1 ,what is the average speed at 100 ∘\circ∘ C?

Which gas is least dense at 1 atm and 25 ∘\circ∘ C?

What volume is occupied by 1.00 kg of helium at 5.00 ∘\circ∘ C at a pressure of 735 Torr?

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

Filters

Calcium cyanamide reacts with H₂O(g)at 150^$\circ$C and 1.00 atm pressure: CaNCN(s)+ 3H₂O(g) $\rightarrow$ CaCO₃(s)+ 2NH₃(g) If 80.0 L of NH₃(g)are produced,what volume of steam is required?

The empirical formula of a gas is CH₃O.If 2.77 g of the gas occupies 1.00 L at exactly 0^$\circ$C at a pressure of 760 Torr,what is the molecular formula of the gas?

Consider the following reaction: 4KO₂(s)+ 2CO₂(g) $\rightarrow$ 2K₂CO₃(s)+ 3O₂(g) How many moles of KO₂ are needed to react with 75.0 L of carbon dioxide at -25^$\circ$C and 215 kPa?

The value of the gas law constant,R,in units of m³.Pa.mol^-¹.K^-¹ is

Calculate the density of camphor,C₁₀H₁₆O,at 80^$\circ$C and 12 Torr.

Calculate the mass of sulfur hexafluoride in a 2.00 L container at a pressure of 4.00 atm and a temperature of 78.0^$\circ$C.The molar mass of sulfur hexafluoride is 146.1 g.mol^-¹.

Which gas is most dense at 1 atm and 25^$\circ$C?

Calculate the mass of oxygen gas required to occupy a volume of 6.00 L at a pressure of 20.9 kPa and a temperature of 37.0^$\circ$C.

Helium,H₂,and neon all have very small values of the van der Waals coefficient "a",whereas Cl₂,xenon,and water have large values.Which gases would you expect to be able to be liquefied by expansion?

If the average speed of a water molecule at 25^$\circ$C is 640 m.s^-1,what is the average speed at 100^$\circ$C?

Which gas is least dense at 1 atm and 25^$\circ$C?

What volume is occupied by 1.00 kg of helium at 5.00^$\circ$C at a pressure of 735 Torr?