Lesson 10 1 Lesson 10 Liquids, Solutions and Phase Equilibria Chapters 13 and 14 (Petrucci et al.) Lesson 10 Phase equilibrium •A phaseis a region of uniform properties •Atphase equilibrium there is no net conversion of one phase to the other –equilibrium is a dynamic process Lesson 10 Vapour pressure •The vapour pressureis the pressure measured when the system reaches phase equilibrium •Pvap= f (T, gas type) •Pvapis intensive (does not depend on the size of the system) •Ex: for H2O at 25 °C, Pvap= 23.8 mmHg. •For mixtures at equilibrium: the partial pressure of each component is given by Pvap.
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