Calculate the vapor pressure of a solution of 0.99 mol of cholesterol in 5.4 mol of toluene at 32°c. pure toluene has a vapor pressure of 41 torr at 32°c. (assume ideal behavior.)

We can get the vapor pressure of the solution from this formula:

Pv (solu) = n P°v

when n is the mole fraction of toluene so we can get by substitution in this formula:

n = moles of toluene / (moles of cholesterol + moles of toluene)

= 5.4 / (0.99 + 5.4) = 0.85

so by substitution in vapor pressure formula:

∴ Pv (solu) = 0.85 * 41 = 34.85 atm