Physical Chemistry Material Equilibrium Calculation of changes in state functions △S= Q2 cpdt avdp (460) . AS for the process(Pl, TD>(P2, T2)is independent of the path used. A convenient path(Fig. 4.5 )is suggested △S Pdr const. P=P,(4.61 △S b avdP const. T-T2(4.62)P AS for the process(P, T1>(P2, T2)is T △S=△Sa+ASb Fig 4.5
Calculation of changes in state functions = − = − 2 1 2 1 2 1 dT VdP T C S S S P (4.60) = 2 1 T T P a dT T C S const. P=P1 (4.61) = − 2 1 P P Sb VdP const. T=T2 (4.62) S = Sa + Sb S for the process (P1 , T1 )→ (P2 , T2 ) is P P1 P2 T1 T2 T 1 2 (a) (b) Fig. 4.5 S for the process (P1 , T1 )→ (P2 , T2 ) is independent of the path used. A convenient path (Fig. 4.5) is suggested. Physical Chemistry Material Equilibrium
Physical Chemistry Material Equilibrium Calculation of h and au AH=CPdT+[(v-tvadP (463 e AH for the process(P), T)->(P2, T2) is independent of the path used. A convenient path(Fig. 4.5 )is suggested AHa=C CpdT const. P-P AH,=(V-TVa)dP const T=T 4H for the process(P, 1)>(P2, T2)is T AH=△AHa+△Hb △U/=△H-△(PV) Fig. 4.5
Calculation of H and U = + − 2 1 2 1 H CP dT (V TV)dP (4.63) = 2 1 T T Ha CP dT const. P=P1 = − 2 1 ( ) P P Hb V TV dP const. T=T2 H = Ha + Hb H for the process (P1 , T1 )→ (P2 , T2 ) is P P1 P2 T1 T2 T 1 2 (a) (b) Fig. 4.5 H for the process (P1 , T1 )→ (P2 , T2 ) is independent of the path used. A convenient path (Fig. 4.5) is suggested. Physical Chemistry U = H − (PV) Material Equilibrium