First slide

Internal energy

Question

Supposing the distance between the atoms of a diatomic gas to be constant, its specific heat at constant volume per mole (gram mole) is

Easy

A

$\frac{3 R}{2}$
B

$\frac{5 R}{2}$
C

$R$
D

$\frac{R}{2}$

Solution

Rigid diatomic molecule only has translational (3) and rotational (2) degrees of freedom.
$C_{V} = \frac{f R}{2} = \frac{5 R}{2}$ .

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