1.19 Enthalpy Change in Chemical Reactions (4) S.J.T.U. Phase Transformation and Applications T-T △HT T-T R aInjeledwaI (C,dT). F(CdT). T=298 △H298 T=298 R P (Reactants (Products) Enthalpy is a point function s∑(nC,dT+△H,=AHs+f∑(nC,dr) △H,=AHs+f[∑(nCr）nias-∑6nCp）)enH SJTU Thermodynamics of Materials Spring 2006 ©X.J.Jin Lecture 3 Second law IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © 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 ΔH298 ΔHT ( ) ∫T P R dTC 298 ( ) ∫T P P dTC 298 Temperature (Reactants) (Products) Enthalpy is a point function ( ) ( ) ∫ ∑ +Δ=Δ+ ∫ ∑T T P products T P tsreac dTnC HH dTnC 298 298 298 tan HH [ () () nC nC ]dT T T ∫ ∑ P products ∑ P tsreac +Δ=Δ − 298 298 tan