Partial Molar Quantities: when 1+1≠2.We are getting ready to talk about mixtures, especially liquid solutions: benzene and toluene, methanol and water, sugar and water etc. We begin by introducing the subject of partial molar quantities, beginning with partial molar volume.The partial molar volume of a component jin a solution containing an arbitrary number of components is :',,nPTjjnVV∂∂=
The unit of the partial molar volume is L or cm3per mole. Thus the partial molar volume is an intensive quantity that depend the temperature, pressure and composition. What is the physical meaning of the partial molar volume?If I had an infinite quantity of some solution and were to add jto the solution molecule by molecule (infinite volume ensures constant composition) and were to measure the volume change with added jthat would be the partial molar volume.
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