When you are designing a chemical plant, it is vitally important to know the pressures that will

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When you are designing a chemical plant, it is vitally important to know the pressures that will be encountered in reaction chambers and transfer piping. In some cases, that involves knowing the vapor pressures of the liquids present. What is the vapor pressure of each component at 25°C and the total vapor pressure of a mixture of benzene and toluene in which one-third of the molecules are benzene(so Xbenzene (1) and Xtoluene (1) =)?

The vapor pressures of pure benzene and toluene at 25°C are 94.6 and 29.1 Torr, respectively.

ANTICIPATE The vapor pressure of the mixture will lie between the values of the pure liquids, closer to the more abundant component, which in this case is toluene. So, you should expect a value between 29 and 95 Torr, but closer to 29 Torr.

PLAN Use Raoult’s law to calculate the vapor pressure of each component, and then use Dalton’s law to calculate the total vapor pressure.

What should you assume? Assume that the liquid mixture and its vapor are ideal.

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Chemical Principles The Quest For Insight

ISBN: 9781464183959

7th Edition

Authors: Peter Atkins, Loretta Jones, Leroy Laverman

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