For ideal gas, C_p - C_v =
AR (Mayer's relation)
B0
C2R
DR/2
Answer & Solution
Correct answer: A. R (Mayer's relation)
Mayer's relation: C_p - C_v = R (per mole). Because at constant P, gas does work against piston as it expands. Holds for ideal gas; corrections for real gases.
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