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304Raoultslaw - ethanol is 44.5 mmHg and that of methanol...

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10/5/2011 1 Raoult’s law Raoult’s law relates the partial pressure of a gas to its vapour pressure in liquid/liquid and liquid/solid solutions: P i = x i P vap, i P vap,i is the vapour pressure of pure substance i For binary, liquid/liquid solutions: P = P 1 + P 2 = x 1 P vap,1 + x 2 P vap,2 = x 1 P vap,1 + (1 x 1 ) P vap,2 Fractional Distillation
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10/5/2011 2 Lesson 19 Distillation Raoult’s law For binary, solid/liquid solutions: P = P solid + P liquid = x solid P vap, solid + x liquid P vap, liquid = x liquid P vap, liquid Since, in general: P vap, liquid >> P vap, solid Example 1 Ethanol (C 2 H 5 OH) and methanol (CH 3 OH) form a nearly ideal solution. At 20
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