5.4 SOLID-VAPOR EQUILIBRIA (1) S.J.T.U. Phase Transformation and Applications 4C(s)+O2(8)→2Cu2O(s) T=1000K AG=-RTIoK。=-RTna2E, 2 0,0 △G°=-339,000-14.24T1nT+247T △G°=-190,360=8.314×10001nPo, nP%,=-22.90,Po,=1.14×10-10atm SJTU Thermodynamics of Materials Spring2006©X.J.Jin Lecture 9 Chemical equilibrium IlPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © X. J. Jin Lecture 9 Chemical equilibrium II 5.4 SOLID-VAPOR EQUILIBRIA (1) )(2)()(4 2 2 →+ sOCugOsCu 2 2 4 2 ln ln OCu OCu P RTKRTG α α −=Δ α −= D G −−=Δ + 247ln24.14000,339 TTT D 2 ln1000314.8360,190 G ×=−=Δ PO D PO PO atm 10 1014.1,90.22ln 2 2 − −= ×= T=1000 K