Problem: The density of toluene (C6H5CH3) at 25°C = 0.862 g/mL, and its vapor pressure at 25°C = 28.44 torr. At 25°C, the vapor pressure of toluene above a solution of naphthalene (C10H8) in 500.0 mL toluene is found to be 27.92 torr. How many grams of naphthalene are present in the solution?

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We’re being asked to determine the mass of naphthalene (C10H8) in a solution with toluene (C6H5CH3). We’re given the vapor pressure of toluene above the solution, 27.92 torr.


Recall that the vapor pressure of a solution can be given by Raoult’s Law:


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Problem Details

The density of toluene (C6H5CH3) at 25°C = 0.862 g/mL, and its vapor pressure at 25°C = 28.44 torr. At 25°C, the vapor pressure of toluene above a solution of naphthalene (C10H8) in 500.0 mL toluene is found to be 27.92 torr. How many grams of naphthalene are present in the solution?

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