2.10 Entropy change in chemical reactions and the third law(2) S.J.T.0. Phase Transformation and Applications The third law provides a great simplification in the calculation of entropies of reaction Ag-A心+f9an-f9n The entropy changes near room temperature are often needed in thermodynamic calculations, the integral in above equation has been evaluated for many substance at 298 K. 298 S98= △H+了 -dT 0 T SJTU Thermodynamics of Materials Fall 2012 X.J.Jin Lecture 5 property relationPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Fall 2012 © X. J. Jin Lecture 5 property relation 2.10 Entropy change in chemical reactions and the third law (2) The third law provides a great simplification in the calculation of entropies of reaction. ∫ ∫ Δ = Δ + = T P T P T dT TC dT TC S S 0 0 00 0 The entropy changes near room temperature are often needed in thermodynamic calculations, the integral in above equation has been evaluated for many substance at 298 K. ∫ ∫ ∫ + Δ + + Δ = + 298 0 0 298 b b m m T P T T b P b m m T P dT T C T H dT T C T H dT T C S