$\mathbf{10}$ moles of $\mathbf{O}_{\mathbf{2}}$ is Heated at Constant volume from $\mathbf{30}{}^{\boldsymbol{\circ}}\mathbf{C}$ to $\mathbf{40}{}^{\boldsymbol{\circ}}\mathbf{C}$.
The change in internal energy is $\underline{\quad}$ Cal.
$(\mathrm{C}_{\mathrm{P},\overline{\mathrm{m}}} = 7\mathrm{Ca/mol}{}^{\circ}\mathrm{C} \quad \mathrm{R} = 2\mathrm{Cal/mol}{}^{\circ}\mathrm{C})$