Diethyl ether has a vapor pressure of 400.0 torr at 18°c. when a sample of benzoic acid (a non-volatile compound) is dissolved in ether, the vapor pressure of the solution is 342 torr. what is the mole fraction of benzoic acid in the solution?

Mole fraction of benzoic acid = 0.855

Explanation:

Vapour pressure of diethyl ether = 400.0 torr

Vapour pressure of the solution = 342 torr

When a non-volatile sotule is added to a volatile solvent, then vapour pressure of solvent decreases and vapour pressure of the solution is directly proportional to mole fraction of the solute.

P_total = Vapour pressure of the solution = 342 torr

x = Mole fraction of the solute

Mole fraction of benzoic acid = 0.855

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