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Molar enthalpy change for vapourisation ...

Molar enthalpy change for vapourisation of 1 mol of water at `100^@C` and 1 bar pressure is 41 kJ`mol^-1`. Assuming water vapour to be a perfect gas, calculate the internal energy change when (i) 1 mol of water is vapourised at 1 bar pressure and `100^@C`

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