A piston is placed on the surface of water at 100 °C contained in a tank, and exerts a pressure of 1 atm on it. The pressure is decreased by an infinitesimal amount, with the result of evaporating 10 g. of water by absorbing 22.5 kJ of heat. Calculate W, ∆U, ∆H, and ∆Hm (molar) for that process. Assume that the variation of liquid water with respect to that of steam is negligible and consider steam as an ideal gas
