Molar Specific Heats and Degrees of Freedom Practice Questions

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13.8Molar Specific Heats and Degrees of Freedom

Physics Revision Questions for Molar Specific Heats and Degrees of Freedom

1) 0.4 moles of a monoatomic ideal gas inside a fixed contained absorb 800 J of heat energy from a heat source. If the initial temperature of gas was 77°C, what will be the final temperature in Kelvin degree at the end of process?

  1. 160 K
  2. 510 K
  3. 237 K
  4. 587 K

Correct Answer: B

2) Three moles of O2 at 27°C are heated at constant volume until the temperature of gas reaches 400 K. What is the amount of heat energy absorbed by the gas during this process? Assume the O2 behaviour as that of an ideal gas.

  1. 13948 J
  2. 3739.5 J
  3. 23247 J
  4. 6232.5 J

Correct Answer: D

3) 176 g of CO2 are heated by 40 K at constant pressure. What is the increase in the internal energy of CO2 if it is assumed as an ideal gas? Take the molar mass of CO2 as 44 g/mol.

  1. 5318.4 J
  2. 324010 J
  3. 3988.8 J
  4. 175507.2 J

Correct Answer: A

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