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Q.

Molecules of an ideal gas are known to have three translational degrees of freedom and two rotational degrees of freedom. The gas is maintained at a temperature of ‘T’. The total internal energy, U of a mole of this gas, and the value of γ=CpCv  are given, respectively, by :

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a

U=52RT  and  γ=75

b

U=5RT  and  γ=75

c

U=5RT  and  γ=65

d

U=52RT  and  γ=65

answer is A.

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Detailed Solution

The gas is diatomic dof = 5γ=CpCV=75 and  U=nCvT=52RT
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