Q. 10

The ratio CP/CV for gas is 1.29. What is the degree of freedom of the molecules of this gas?

Answer :

Given:


= 1.29


Formula used:


… (i),


where


γ = ratio of molar heat capacities at constant pressure to constant volume


f = number of degrees of freedom


(i) becomes :



=> … (ii)


Substituting γ = 1.29 in (ii), we get


f = = 6.89 which is approximately equal to 7.


Thus, the number of degrees of freedom is approximately equal to 7.


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