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Question

Suppose the distance between the atoms of a diatomic gas remains constant. Its specific heat at constant volume per mole is


Correct Answer
A
5R2
Your Answer
B
3R2
Your Answer
C
7R2
Your Answer
D
9R2

Solution

The correct option is C 5R2
Since, the distance between atoms of the given diatomic gas remains constant, hence the molecule is not vibrating. This means gas is at room temperature.
Therefore, total degrees of freedom of an atom of a diatomic gas is 5 which are 3 translational and 2 rotational.
Thus specific heat at constant volume per mole, 
Cv=fR2
Cv=5R2

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