P = r H =43.93 kJ·mol ― 1 1mol水蒸发过程做的体积功为 W=p V= v RT=1×8.314×10 ― 3 kJ·mol ― 1 ·K ― 1 ×298 K=2.48 kJ·mol ― 1 U= Q―W =43.93 kJ·mol ― 1 ―2.48 kJ·mol ― 1 =41.45 kJ·mol ― 1
