Question

The vapor pressure of diethyl ether (ether) is 463.6 mm Hg at 25 °C. 

How many grams of chlorophyll C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 268.0 grams of diethyl ether to reduce the vapor pressure to 457.6 mm Hg ?

diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol.
Answer:
   _____  g chlorophyll

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