2.28 What is the enthalpy change for the vaporization of water at 0C ? This value may be estimated from Table C.2 by assuming that the heat capacities of H2O(l) and H2O(g) are independent of temperature from 0 to 25C. fHm(H2O,1)=285.830kJmol1fHm(H2O,g)=241.818kJmol1Cp,m(H2O,1)=75.291JK1mol1Cp,m(H2O,g)=33.577JK1mol1 Ex3anple: There are Ar(g) at 0C,100kPa and 500gCu(s) at 100C in a 200dm3 adiabatic container, calculate final T and p of the system when it reaches equilibrium, calculate DH and DS of the process. Given Cp,m(Ar,g)=20.786Jmol1K1, Cp,m(Cu,s)=24.435Jmol1K1 and both Cp,m(Ar,g) and Cp,m(Cu,s) don't chang with temperature