Enthalpy of Mixing:Ideal Solution(1) S.J.T.U. Phase Transformation and Applications The enthalpy of mixing of a solution, -re JA T -☐9。=a, For an ideal solution: G=RTIngA=RTInxA d(RInxA)=0=H=HA-HA d1/T） The enthalpy of mixing of an ideal solution is zero: HM=xAH+B万g=0 (ideal solution) SJTU Thermodynamics of Materials Spring 2007 ©X.J.Jin Lecture 11 Solution IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2007 © X. J. Jin Lecture 11 Solution I Enthalpy of Mixing: Ideal Solution (1) P P T Hd T G d ⎟⎠⎞ ⎜⎝⎛ ⎟ Δ= ⎠⎞ ⎜⎝⎛ Δ 1 rel A rel A H T d T G d = ⎟⎠⎞ ⎜⎝⎛ ⎟⎟⎠⎞ ⎜⎜⎝⎛ 1 A A rel A = RTG lnα = ln xRT ( ) A A rel A A HHH Td xRd 0 −=== /1 )ln( =+= 0 rel B B rel M A A HxHxH (ideal solution) The enthalpy of mixing of a solution, For an ideal solution: The enthalpy of mixing of an ideal solution is zero: