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Q 3047623583.     If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1bar and `100°C` is `41kJ mol^(–1)`. Calculate the internal energy change, when

(i) 1 mol of water is vaporised at 1 bar pressure and `100°C.`
(ii) 1 mol of water is converted into ice.

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