1.19 Enthalpy Change in Chemical Reactions(4) S.J.T.U. Phase Transformation and Applications T-T △HT T-T R aInjeledweI CrdT) J298 (CdT). T=298 △H298 T=298 R P (Reactants (Products) Enthalpy is a point function g∑tnC,dn）nnns+aMH,=△lH8+o∑tnC,dn）)potow △H,=△Hos+fg∑nCp))prc-∑nCr))HT SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 3 Second law IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 3 Second law I 1.19 Enthalpy Change in Chemical Reactions (4) T=T R T=298 R T=T P T=298 P H298 HT    T P R C dT 298    T P P C dT 298 Temperature (Reactants) (Products) Enthalpy is a point function              T T P products T P reac ts nC dT H H nC dT 298 298 298 tan H H  nC  nC  dT T T   P products  P reac ts      298 298 tan