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Question

Cv is nearly 12.55 J mol1 for:
(correct answer +1, wrong answer -0.25)
  1. All gases
  2. Diatomic gases
  3. Hydrogen and helium only
  4. Monoatomic gases


Solution

The correct option is D Monoatomic gases
Cv for monoatomic gas = 32R=1.5×8.314=12.471 J mol1
Cv for diatomic gas = 52R=2.5×8.314=20.7 J mol1
Cv=12.471 J mol1 for all monoatomic gases.
H2 is a diatomic gas and He is a monoatomic gas.

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