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IRINA_888 [86]
3 years ago
9

Diethyl ether has a vapor pressure of 400.0 torr at 18°C. When a sample of benzoic acid is dissolved in ether, the vapor pressur

e of the solution is 342 torr. What is the mole fraction of benzoic acid in the solution?
a) 0.0169
b) 0.0197
c) 0.145
d) 0.855 e.
Chemistry
1 answer:
andriy [413]3 years ago
5 0

Answer:

c) 0.145

Explanation:

By Raoult's Law, the pressure of a solution is equal to the molar fraction of the solvent multiplied by its vapor pressure. The solvent here is ether, so

342 = x*400

x = 342/400

x = 0.855

The solution has only ether and benzoic acid, so the molar fraction of benzoic acid will be

1 - 0.855 = 0.145

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