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Q.

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is :

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a

3RT

b

32RT

c

92RT

d

52RT

answer is C.

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Detailed Solution

Degrees of freedom for a non linear triatomic molecule =  Three Translation + Three Rotation = 6 

(or) f=3A-B=3(3)-3=6   A=no. of atoms and B= no of restrictions

U=f2RT=62RT=3RT

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