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Question:

When heat Q is supplied to a diatomic gas of rigid molecules, at constant volume its temperature increases by ΔT. The heat required to produce the same change in temperature, at a constant pressure is :

23Q

53Q

32Q

75Q

Solution:

Correct option is A.
75Q
Q = nCvΔT
Q' = nCpΔT
∴Q'/Q = Cp/Cv
For diatomic gas : Cp/Cv = γ = 7/5
Q' = 7/5Q