alleryMayer's relation for an ideal gas is:
A$C_P - C_V = R$
B$C_P + C_V = R$
C$C_P \cdot C_V = R$
D$C_P / C_V = R$
Answer & Solution
Correct answer: A. $C_P - C_V = R$
**Mayer:** $C_P - C_V = R$ (per mole).
Heat added at constant P goes to internal energy AND work (PΔV)
at constant V, only internal energy.
The difference equals the work term $PdV = RdT$ per mole.
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