The milar enthalpy change for $\mathrm{H}_{2} \mathrm{O}(1) \rightleftharpoons \mathrm{H} 2 \mathrm{O}(\mathrm{g})$ at $373 \mathrm{~K}$ and $1 \mathrm{~atm}$ is $41 \mathrm{~kJ} / \mathrm{mol}$. Assuming ideal behavior, the internal energy change for vaporization of 1 mol of water at $373 \mathrm{~K}$ and 1 atm in $\mathrm{kJ} \mathrm{mil}^{-1}$ is