estimate of the enthalpy of evaporation of water at 25∘C (in kJ/kg) is ____________

Question

For water at 25⁰C, dP_s/dT_s = 0.189 kPa/K (P_s is the saturation pressure in kPa the T_s is the saturation temperature in K) and the specific volume of dry saturated vapour is 43.38 m³/kg. Assume that the specific volume of liquid is negligible in comparison with that of vapour. Using the Clausius – Clapeyron equation, an estimate of the enthalpy of evaporation of water at 25⁰C (in kJ/kg) is ____________