Hydrogen is a diatomic molecules and if vibrational degrees of freedom are increased the degrees of freedom will be \(3\) translation \(2\) rotational and two vibrational.
\(\therefore\) So total \(7\) degree of freedom.
Fraction of energy possessed due to rotational motion : Degree of freedom due to rotation total degree of freedom \(=\frac{2}{7}\)
$\left(\right.\left.{k}_{{B}}=1.38 \times 10^{-23} \, {J} / {K}\right)$