For water at 25°C, dp s /dT s = 0.189 kPa/K (p s is the saturation pressure in kPa and T s is the saturation temperature in K) and the specific volume of dry saturated vapour is 43.38 m 3 /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 25°C (in kJ/kg) is _________.

GATE Mechanical Engineering (ME) 2016 Shift 1 Solved Paper

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For water at 25°C, dp_s/dT_s = 0.189 kPa/K (p_s is the saturation pressure in kPa and 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 25°C (in kJ/kg) is _________.

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