5.2 CHEMICAL EQUILIBRIUM S.J.T.U. Phase Transformation and Applications bB+cC=dD+eE Expression for a chemical reaction OWron=AG=dGD+eGE-bGB-cGc GB =G&+RTInag AG=d(Gi+RTInap)+e(GE+RTIndE)-b(GB+RT Inag)-c(Gc+RT Inac) △G=△G°+RTIn J △G°=dG)+eGE-bGB-cG& Equilibrium constant d e J b C △G°=-RTInm）)=-RTIn K SJTU Thermodynamics of Materials Spring2007©X.J.Jin Lecture 8 Chemical equilibriumPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 8 Chemical equilibrium 5.2 CHEMICAL EQUILIBRIUM + = + eEdDcCbB δ rev D E B −−+=Δ= GcGbGeGdGW C )ln()ln()ln()ln( D +=Δ RTGdG α D E ++ RTGe α E B +− RTGb α B C +− RTGc α C D D D D α +Δ=Δ ln JRTGG D D D D D D D E B C −−+=Δ cGbGeGdGG c C b B e E d D J αα αα α = B BB += RTGG lnα D α KRT α JRTG mequilibriu −=Δ ln ( ) −= ln D Equilibrium constant Expression for a chemical reaction