Heat and Thermodynamics 1 Question 8

8. Cp and CV are specific heats at constant pressure and constant volume, respectively. It is observed that CpCV=a for hydrogen gas CpCV=b for nitrogen gas. The correct relation between a and b is

(2017 Main)

(a) a=b

(b) a=14b

(c) a=28b

(d) a=114b

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Solution:

  1. By Mayor’s relation, for 1g mole of a gas,

CpCV=R

So, when n gram moles are given,

CpCV=Rn

As per given question,

a=CpCV=R2; for H2b=CpCV=R28; for N2a=14b



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