# 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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80% (276 ratings)
###### FREE Expert Solution

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:

80% (276 ratings) ###### 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?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the The Colligative Properties concept. You can view video lessons to learn The Colligative Properties. Or if you need more The Colligative Properties practice, you can also practice The Colligative Properties practice problems.

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Our tutors rated the difficulty ofThe density of toluene (C6H5CH3) at 25°C = 0.862 g/mL, and i...as medium difficulty.

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