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Questions  

When heat is supplied to a diatomic gas at constant  pressure, then the ratio of ΔQ : ΔU : ΔW will be

a
5:2:6
b
7:2:5
c
5:3:2
d
7:5:2

detailed solution

Correct option is D

We know that, ΔQ=nCpΔT=72nRΔT ∵Cp=72Rand    ΔU=nCVΔT=52μRΔT ∵CV=52RAlso,   ΔW=ΔQ−ΔU=nRΔT∴ ΔQ:ΔU:ΔW=7:5:2

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