# The vapor pressure of chloroform is 173.11 mm Hg at 25°C.How many grams of cholesterol, C27H46O, a nonvolatile, nonelectrolyte (MW = 386.6 g/mol), must be added to 280.3 grams of chloroform to reduce the vapor pressure to 169.22 mm Hg ?chloroform = CHCl3 = 119.40 g/mol. g cholesterol

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The vapor pressure of chloroform is 173.11 mm Hg at 25°C.

How many grams of cholesterolC27H46O, a nonvolatile, nonelectrolyte (MW = 386.6 g/mol), must be added to 280.3 grams of chloroform to reduce the vapor pressure to 169.22 mm Hg ?

chloroform = CHCl3 = 119.40 g/mol.

g cholesterol

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Step 1

Relative lowering of vapor pressure is equal to the mole fraction of solute.

Step 2

So mole fraction can be calculated as below,

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