The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is chlorophyll. Calculate the vapor pressure of the solution at 25 °C when 11.79 grams of chlorophyll, C55H72MgN4O5 (893.5 g/mol), are dissolved in 153.2 grams of diethyl ether. diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol. VP(solution) = mm Hg

The vapor pressure of the solution at is 460.63 mmHg

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

where,

= relative lowering in vapor pressure

i = Van'T Hoff factor = 1 (for non electrolytes)

= mole fraction of solute  =

Given : 11.79 g of chlorophyll  is present in 153.2 g of diethyl ether

moles of solute (chlorophyll) =

moles of solvent (diethyl ether) =

Total moles = moles of solute + moles of solvent =0.01319 + 2.067 = 2.080

= mole fraction of solute  =

Thus the vapor pressure of the solution at is 460.63 mmHg

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