Problem: Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (M = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.A) 54 torrB) 154 torrC) 246 torrD) 346 torrE) 400. torr

FREE Expert Solution

For this problem, we have to calculate the vapor pressure of the solution with 0.5 mol of solute at 275 g hexane (C6H14)

The vapor pressure of a solution prepared by adding a nonvolatile solute to a volatile solvent is calculated using this formula:


Psol = Psolvento·Xsolvent

We will need the mole fraction of hexane to calculate the vapor pressure of solution.

Mole fraction is defined as:


mole fraction X = moles of a componenttotal moles


For this problem, follow the steps

Step 1. Calculate moles of hexane

Step 2. Calculate mole fraction of hexane

Step 3. Calculate the vapor pressure


Step 1. Mole fraction of hexane can be calculated by dividing the moles of hexane by the total moles

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Problem Details

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (M = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

A) 54 torr

B) 154 torr

C) 246 torr

D) 346 torr

E) 400. torr

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