Problem: At 20 oC the vapor pressure of benzene C6H6 is 75 torr and that of toluene C7H8 is 22 torr. Assume that benzene and toluene form an ideal solution.In a solution composed of benzene and toluene that has a vapor pressure of 36  torr at 20 oC, what is the mole fraction of toluene?

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FREE Expert Solution
FREE Expert Solution

Recall that the partial pressure of a gas (PGas)in a mixture is given by:

Pgas=χgasPtotal


where χGas = mole fraction of the gas and Ptotal = total pressure of the gas mixture


Isolating the mole fraction of the gas:

PgasPtotal=χgasPtotalPtotalχgas=PgasPtotal

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Problem Details

At 20 oC the vapor pressure of benzene C6H6 is 75 torr and that of toluene C7H8 is 22 torr. Assume that benzene and toluene form an ideal solution.

In a solution composed of benzene and toluene that has a vapor pressure of 36  torr at 20 oC, what is the mole fraction of toluene?

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Based on our data, we think this problem is relevant for Professor Singh's class at HCC.