[QUE/TH-08005] TH-PROBLEM

The entropy of water at $100^o$C is $310 \,{\rm{calories/(Kg-Kelvin)}}$ and that of steam at the same temperature is $1760\, {\rm{calories/(Kg-Kelvin)}}$.

(a) What is the latent heat of vaporization at this temperature? Express your answer in calories/Kg.

(b) The enthalpy $H\,=\,U\,+\,PV$ of steam under these conditions is $64\times10^4 {\rm{calories/Kg}}$. Calculate the enthalpy of water in calories/Kg under the same conditions.

(c) Calculate the Gibbs free energy $G\,=\,U\,-\,TS\,+\,PV$
in calories/Kg.