Two ideal gases A (monatomic) and B (rigid diatomic) at same T are mixed in equal moles. The effective $\gamma$ of the mixture is approximately:
A$\gamma_A = 5/3$
B$\gamma_B = 7/5$
C~ 1.5 (between A and B)
D$\gamma = 1$
Answer & Solution
Correct answer: C. ~ 1.5 (between A and B)
Effective $C_V = (n_A C_{V,A} + n_B C_{V,B})/(n_A + n_B) = ((3/2 + 5/2)/2) R = 2R$. Effective $C_P = 2R + R = 3R$. $\gamma_{mix} = 3R/2R = 1.5$.
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