If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mol of water at 1bar and 1

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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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