Question 1

To what temperature must a balloon, initially at 25 °C and 2.00 L, be heated to have a volume of 6.00 L?

Accepted Answer

A)  993 K 
B)  403 K 
C)  75 K 
D)  655 K 
E)  894 K 
A)  993 K 
B)  403 K 
C)  75 K 
D)  655 K 
E)  894 K

Question 2

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L-1 aqueous solution of KI according to the chemical equation shown below? 
O3(g) + 2I-(aq) + H2O(l) → O2(g) + I2(s) + 2OH-(aq)

Accepted Answer

A)  54.8 mL 
B)  110 mL 
C)  165 mL 
D)  220 mL 
A)  54.8 mL 
B)  110 mL 
C)  165 mL 
D)  220 mL

Question 3

Determine the density of CO2 gas at STP.

Accepted Answer

A)  1.94 g   
B)  1.80 g   
C)  2.24 g   
D)  4.46 g   
E)  5.10 g   
A)  1.94 g   
B)  1.80 g   
C)  2.24 g   
D)  4.46 g   
E)  5.10 g

Question 4

Place the following gases in order of increasing density at STP. N2 NH3 N2O4 Ar

Accepted Answer

A)  N2O4 2 3 
B)  Ar 2O4 2 3 
C)  N2 2O4 3 
D)  NH3 2 2O4 
E)  Ar 2 3 2O4 
A)  N2O4 2 3 
B)  Ar 2O4 2 3 
C)  N2 2O4 3 
D)  NH3 2 2O4 
E)  Ar 2 3 2O4

Question 5

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

Accepted Answer

A)  1.86 bar 
B)  0.649 bar 
C)  0.536 bar 
D)  1.54 bar 
E)  0.955 bar 
A)  1.86 bar 
B)  0.649 bar 
C)  0.536 bar 
D)  1.54 bar 
E)  0.955 bar

Question 6

Calculate the temperature if 3.120 moles of He has a pressure of 2.45 bar in a 23.8 L container.

Accepted Answer

A)  218 K 
B)  314 K 
C)  225 K 
D)  334 K 
E)  287 K 
A)  218 K 
B)  314 K 
C)  225 K 
D)  334 K 
E)  287 K

Question 7

What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and 94.6 g CO2 at 398 K?

Accepted Answer

A)  7.11 bar 
B)  39.6 bar 
C)  40.1 bar 
D)  47.2 bar 
E)  58.7 bar 
A)  7.11 bar 
B)  39.6 bar 
C)  40.1 bar 
D)  47.2 bar 
E)  58.7 bar

Question 8

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 bar). The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

Accepted Answer

A)  36.1 L 
B)  45.3 L 
C)  18.1 L 
D)  27.6 L 
E)  32.5 L 
A)  36.1 L 
B)  45.3 L 
C)  18.1 L 
D)  27.6 L 
E)  32.5 L

Question 9

A mixture of N2, O2, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 bar?

Accepted Answer

A)  2.5 bar 
B)  0.39 bar 
C)  0.67 bar 
D)  0.98 bar 
E)  1.33 bar 
A)  2.5 bar 
B)  0.39 bar 
C)  0.67 bar 
D)  0.98 bar 
E)  1.33 bar

Question 10

Calculate the root mean square velocity of molecular hydrogen at 251.0 K.

Accepted Answer

A)  1692 m s-1 
B)  1875 m s-1 
C)  1342 m s-1 
D)  715.6 m s-1 
E)  1762 m s-1 
A)  1692 m s-1 
B)  1875 m s-1 
C)  1342 m s-1 
D)  715.6 m s-1 
E)  1762 m s-1

Question 11

According to Boyle's law, decreasing the volume of a gas sample will result in ________ in the pressure. Boyle's law assumes constant temperature and a constant amount of gas.

Accepted Answer

A)  an increase 
B)  a decrease 
C)  no change 
D)  a decrease and then an increase 
E)  an increase and then a decrease 
A)  an increase 
B)  a decrease 
C)  no change 
D)  a decrease and then an increase 
E)  an increase and then a decrease

Question 12

Determine the density of   gas at 278 K and 1.00 bar.

Accepted Answer

A)  1.14 g   
B)  2.37 g   
C)  1.90 g   
D)  3.08 g   
E)  2.11 g   
A)  1.14 g   
B)  2.37 g   
C)  1.90 g   
D)  3.08 g   
E)  2.11 g

Question 13

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

Accepted Answer

A)  1.10 bar 
B)  0.940 bar 
C)  1.08 bar 
D)  0.953 bar 
E)  0.919 bar 
A)  1.10 bar 
B)  0.940 bar 
C)  1.08 bar 
D)  0.953 bar 
E)  0.919 bar

Question 14

What pressure will 14.0 g of CO exert in a 3.5 L container at 75 °C?

Accepted Answer

A)  4.1 bar 
B)  5.0 bar 
C)  6.4 bar 
D)  1.1 bar 
E)  2.3 bar 
A)  4.1 bar 
B)  5.0 bar 
C)  6.4 bar 
D)  1.1 bar 
E)  2.3 bar

Question 15

A 0. 600 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation: 
2Ag2O(s) → 4Ag(s) + O2(g)
If 13.8 mL of gas are collected over water at 27 °C and 1.001 bar external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mmHg at 27 °C.

Accepted Answer

A)  10.4% 
B)  20.9% 
C)  41.8% 
D)  44.8% 
A)  10.4% 
B)  20.9% 
C)  41.8% 
D)  44.8%

Question 16

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H2?

Accepted Answer

A)  1.17 bar 
B)  0.865 bar 
C)  1.03 bar 
D)  0.969 bar 
E)  0.649 bar 
A)  1.17 bar 
B)  0.865 bar 
C)  1.03 bar 
D)  0.969 bar 
E)  0.649 bar

Question 17

Which of the following gases has the lowest root mean square velocity at constant temperature?

Accepted Answer

A)  NH3 
B)  CO2 
C)  NO2 
D)  F2 
E)  O3 
A)  NH3 
B)  CO2 
C)  NO2 
D)  F2 
E)  O3

Question 18

A mixture of He, Ne, and Ar has a pressure of 7.85 bar. If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23, what is the pressure of He?

Accepted Answer

A)  4.2 bar 
B)  3.7 bar 
C)  1.8 bar 
D)  5.5 bar 
E)  2.4 bar 
A)  4.2 bar 
B)  3.7 bar 
C)  1.8 bar 
D)  5.5 bar 
E)  2.4 bar

Question 19

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? 
Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Accepted Answer

A)  0.171 g 
B)  5.76 g 
C)  11.7 g 
D)  131 g 
A)  0.171 g 
B)  5.76 g 
C)  11.7 g 
D)  131 g

Question 20

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C2H2, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?

Accepted Answer

A)  2.60 g 
B)  10.0 g 
C)  67.8 g 
D)  990 g 
A)  2.60 g 
B)  10.0 g 
C)  67.8 g 
D)  990 g

Exam 5: Gases

To what temperature must a balloon, initially at 25 °C and 2.00 L, be heated to have a volume of 6.00 L?

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L-1 aqueous solution of KI according to the chemical equation shown below? O3(g) + 2I-(aq) + H2O(l) → O2(g) + I2(s) + 2OH-(aq)

Determine the density of CO2 gas at STP.

Place the following gases in order of increasing density at STP. N2 NH3 N2O4 Ar

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

Calculate the temperature if 3.120 moles of He has a pressure of 2.45 bar in a 23.8 L container.

What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and 94.6 g CO2 at 398 K?

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 bar). The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

A mixture of N2, O2, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 bar?

Calculate the root mean square velocity of molecular hydrogen at 251.0 K.

According to Boyle's law, decreasing the volume of a gas sample will result in ________ in the pressure. Boyle's law assumes constant temperature and a constant amount of gas.

Determine the density of gas at 278 K and 1.00 bar.

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

What pressure will 14.0 g of CO exert in a 3.5 L container at 75 °C?

A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H2?

Which of the following gases has the lowest root mean square velocity at constant temperature?

A mixture of He, Ne, and Ar has a pressure of 7.85 bar. If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23, what is the pressure of He?

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C2H2, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?

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Filters

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L^-1 aqueous solution of KI according to the chemical equation shown below? O₃(g) + 2I^-(aq) + H₂O(l) → O₂(g) + I₂(s) + 2OH^-(aq)

Determine the density of CO₂ gas at STP.

Place the following gases in order of increasing density at STP. N₂ NH₃ N₂O₄ Ar

A mixture of 0.220 moles CO, 0.350 moles H₂, and 0.640 moles He has a total pressure of 2.95 bar. What is the pressure of CO?

What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and 94.6 g CO₂ at 398 K?

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 bar). The molar mass of FeS₂ is 119.99 g mol^-1. 4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

A mixture of N₂, O₂, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N₂ if the total pressure of the mixture is 3.9 bar?

A mixture of 0.220 moles CO, 0.350 moles H₂, and 0.640 moles He has a total pressure of 2.989 bar. What is the pressure of H₂?

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

A 45.0 L steel tank at 20.0 °C contains acetylene gas, C₂H₂, at a pressure of 1.41 bar. Assuming ideal behaviour, how many grams of acetylene are in the tank?