Thermodynamics

For water \(\Delta\)_vap H = 41 kJ mol^\(-\)1 at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is ___________ kJ mol^\(-\)1

[Use : R = 8.3 J mol^\(-\)1 K^\(-\)1]