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The vapor pressure of diethyl ether (ether) is 463.57 mm Hg at 25 °C. How many grams of testosterone, C19H28O2, a nonvolatile, nonelectrolyte (MW = 288.4 g/mol), must be added to 261.3 grams of diethyl ether to reduce vapor pressure to 458.75 mm Hg? diethyl ether = CH3CH2OCH2CH3 = 74.12 g/mol.