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Cp - Cv = R is valid for gases

This question belongs to Chemical Engineering Chemical Engineering Thermodynamics
Chemical Engineering Thermodynamics
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Cp - Cv = R is valid for __________ gases.

Answer & Solution
Correct Answer: Option A
$${C_P} - {C_V} = R,$$    is valid for ideal gas and we can prove this by using $$T-dS$$  equations.
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