calculate internal energy change when 1 mole of H2O is converted into ice

calculate internal energy change when 1 mole of H2O is converted into ice

If water is assumed to be perfect gas,molar enthalpy change for vapourisation of 1 mole of H2O at 1 bar and 100 degree celcius is 41 KJ per mole,calculate internal energy change when 1 mole of H2O is converted into ice