alleryFor a diatomic ideal gas (γ = 7/5), molar Cv equals:
A3R/2
BR
C5R/2
D7R/2
Answer & Solution
Correct answer: C. 5R/2
**For diatomic:** 5 degrees of freedom (3 trans + 2 rot). Cv = (5/2)R = 2.5R.
Then Cp = Cv + R = 3.5R = (7/2)R. γ = 7R/5R = 7/5 ✓.
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