If water vapour is assumed to be a perfe...

If water vapour is assumed to be a perfect gas and molar enthalpy change for vapourisation of 1 mole of water at 1 bar `& 100^@C` is 41 kJ `mol^-1`, calculate the intenal energy change when 1 mol of water is vapourised at 1 bar pressure `& 100^@C`

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