304Raoultslaw

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 °C, the vapour pressure of
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Unformatted text preview: ethanol is 44.5 mmHg and that of methanol is 88.7 mmHg. a) Calculate the partial pressures and the total vapour pressure of this solution and the mole fraction of ethanol in the vapour if n ethanol = 1.3 mol and n methanol = 1.25 mol. b) Assume that you can condense the vapour phase alone. Calculate the vapour pressure of the condensed vapour phase and the mole fraction of ethanol in the vapour. 10/5/2011 3 Suggested readings 13.6 Vapour Pressures of Solutions...
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304Raoultslaw - ethanol is 44.5 mmHg and that of methanol...

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