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Two moles of helium gas is mixed with three moles of hydrogen molecules (taken to be rigid). What is the molar specific heat of mixture at constant volume ? (R = 8.3 J/mol K)

1. 21.6 J/mol K
2. 19.7 J/mol K
3. 15.7 J/mol K
4. 17.4 J/mol K

Correct answer: 17.4 J/mol K

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