Partial Molar Quantities (2) S.J.T.U. Phase Transformation and Applications 3N Slope av -VB dnB Definition of partial molar volume T.P.nA VA av )T.PnB dv V adna +V Bdng nB→ Ethanol-water solution:70 mol%/30 mol% Figure 7.2 Volume of solution A-B as a func- One mole of water:approximately 16 cm3 tion of moles of B added to the solution. Not 18 cm3(for pure water) SJTU Thermodynamics of Materials Spring 2006 ©X.J.Jin Lecture 12 Solution IPhase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2006 © X. J. Jin Lecture 12 Solution I Partial Molar Quantities (2) A A B B += dnVdnVdV nPT B A A n V V ,, ⎟⎟⎠⎞ ⎜⎜⎝⎛ ∂∂ = Definition of partial molar volume Ethanol-water solution: 70 mol% / 30 mol% One mole of water: approximately 16 cm3 Not 18 cm3 (for pure water)