Chemistry 20: Module 3: Lesson 41Assignment

Module 3: Lesson 4 ASSIGNMENT

Lesson 4 Assignment: Molar Volume and the Ideal Gas Law

Part 1:Lab: Molar Volume of a Gas

Data

Record the data collected from the experiment in the table below.
Mass of zinc used (g)
Molecular weight of zinc (g/mol)
Volume of 6 mol/L HCL (mL)
Initial pressure inside flask
Maximum pressure reached during the experiment
Initial temperature inside flask
Maximum temperature reached during the experiment
Final pressure in the gas piston at the conclusion of the experiment
Volume of gas collected in the piston

Analysis

1. / Calculate the following:
a. / moles of zinc reacted

Answer:

b. / moles of hydrogen produced

Answer:

c. / molar volume of the ideal hydrogen gas at room temperature (final volume in the gas piston / moles of hydrogen gas), expressed as L/mol

Answer:

2. /
  1. Compare the experimental value for the molar volume at 21°C with the value of 24.5 L/mol (listed in the Background section of the lab manual) using the following formula:
    % error = (experimental molar volume – predicted molar volume) / predicted molar volume * 100%

Answer:

b. / In your opinion, is the percentage error acceptable? What may have been a source of error in this experiment? How does this compare to your hypothesis?

Answer:

Part 2

1. / Hydrogen cyanide gas is produced industrially by this reaction:
2 CH4(g) + 3 O2(g) + 2 NH3(g) → 2 HCN(g) + 6 H2O(g)
What volumes of O2(g) and NH3(g) are needed to react with 8.0 L of CH4(g) at STP?
  1. 12 L of O2(g) and 8 L of NH3(g)
  2. 4 L of O2(g) and 8 L of NH3(g)
  3. 8 L of O2(g) and 12 L of NH3(g)
  4. 12 L of O2(g) and 4 L of NH3(g)

Answer:

2. / Use the following balanced equation to answer the question.
2 H2(g) + O2(g) → 2 H2O(g)
If 10.0 L of hydrogen reacted with 5.0 L of oxygen, the volume of water vapour formed is
  1. 2.0 L
  2. 5.0 L
  3. 10 L
  4. 15 L

Answer:

3. / Three 1.0-L flasks contain He(g), N2(g), and H2S(g) at SATP. Which statement indicates the relative number of molecules in the flasks?
  1. The flask of He(g) contains the most molecules.
  2. The flask of N2(g)contains the most molecules.
  3. The flask of H2S(g) contains the most molecules.
  4. All three flasks contain the same number of molecules.

Answer:

4. / Hydrogen sulfide gas is combusted with oxygen gas to produce sulfur dioxide gas and water vapour. If there is 48.4 L of oxygen available, what volume of hydrogen sulfide gas may be combusted if the pressure is held constant at 105 kPa and the temperature is held constant at 190°C?

Answer:

5. / Butane gas is combusted to produce carbon dioxide and water vapour. If 5.50 mol of butane are reacted, how many moles of water vapour are produced?

Answer:

6. / Ammonia is produced from its elements in a formation reaction. If 8.90 × 1024 molecules of ammonia are produced, how many molecules of hydrogen were used?

Answer:

7. / Hydrogen gas can be used in weather balloons because of its low density. The volume occupied by 3.00 mol of hydrogen at SATP is
  1. 6.23 L
  2. 67.2 L
  3. 73.6 L
  4. 74.4 L

Answer:

8. / A 2.50-L balloon contains 0.100 mol of air at 115 kPa pressure. The temperature of the air in the balloon is
  1. 30°C
  2. 73°C
  3. 100°C
  4. 346°C

Answer:

9. / Examine the following statements made by students.
  1. Pressure is directly proportioned to temperature when all other variables are held constant.
  2. Pressure is directly proportioned to volume when all other variables are held constant.
  3. Volume is directly proportioned to temperature when all other variables are held constant.
  4. The number of moles is directly proportioned to volume when all other variables are held constant.
Which statements apply to ideal gases?
  1. I and II
  2. II and III
  3. I and III
  4. I, III, and IV

Answer:

10. / Chlorine, a poisonous yellow gas, can be produced by mixing vinegar and bleach for a cleaning solution. The volume occupied by 150 g of chlorine at –12.5°C and 98.5 kPa is
  1. 46.5 L
  2. 47.4 L
  3. 52.5 L
  4. 93.0 L

Answer:

11. / Carbon dioxide gas is sometimes used to carbonate beverages. A sample of carbon dioxide occupies a volume of 180 mL at 35.0°C and 88.9 kPa. The volume occupied by the gas at STP is
  1. 140 mL
  2. 155 mL
  3. 178 mL
  4. 181 mL

Answer:

12. / Helium gas is contained in a tank with a pressure of 12.4 MPa. If the temperature inside the tank is 32.8°C and the volume of the tank is 18.0 L, determine the mass of helium in the tank.

Answer:

13. / If 77.60 g of nitrogen gas are produced in a reaction, what is the volume if the temperature is 48°C and the pressure is 99.5 kPa?

Answer:

Once you have completed all of the questions, submit your work to your teacher.