One kg of a diatomic gas is at a pressure of $8 \times 10^4$ $N/m^2$ The density of the gas is $4$ $kg/m^3$ What is the energy (in $\times 10^4\; J$) of the gas due to its thermal motion?
AIEEE 2009, Medium
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$\text { (Given } R =8.31\,J / mol.K )$