Question

9.2-1. In a particular solid-liquid phase transition the point Po, To lies on the coexistence curve. The latent heat of vaporization at this point is lo. A nearby point on the coexistence curve has pressure Po+ p and temperature To+ ; the local slope of the coexistence curve in the P-T plane is p/t. Assuming v, cp, a, and K to be known in each phase in the vicinity of the states of interest, find the latent heat at the point Po + p, To + t.

Answer 1

ne- Anscwer Given liquid phase transition the paint particular solid-1 CuY Ve Coexistence the Pe, T lies n is lo haat of vaporìsation at this point Latent coexistence the has Curve point on pressure Po + P temperat ure Tott in the P-T plane is lecal slope of tho co existence CusVe P/t Tha Latent heat at he ojetive is to deteruvine the point PTp and we hawe ds - latent heat= ionhuidselidj av nd k ap from tho Clousius-Clapeyron euation know that the houn belor slope phoye change Cwwe

foge ne-2 dP dT TAV whereLJatent heat Yolume pen mole of phase tansition. Change AV definition of enthalp from the H Ut PV function T and entholey the Hare Consider we Can H H (T, P) P, Frem dH Cpd V 1 v -T dH CpdT dp. latent the expresion above te Can keat copacity at point Ptp and To T