How many grams of testosterone, C19H28O2 (288.4 g/mol), must be dissolved in 255.0 grams of ethanol to reduce the freezing point by 0.450°C ? Refer to the table for the necessary boiling or freezing point constant.

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The freezing point of ethanol CH3CH2OH is -117.30°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is testosterone .

How many grams of testosterone, C19H28O2 (288.4 g/mol), must be dissolved in 255.0 grams of ethanol to reduce the freezing point by 0.450°C ? Refer to the table for the necessary boiling or freezing point constant.

Solvent Formula Kb (°C/m) Kf (°C/m)
Water H2O 0.512 1.86
Ethanol CH3CH2OH 1.22 1.99
Chloroform CHCl3 3.67  
Benzene C6H6 2.53 5.12
Diethyl ether CH3CH2OCH2CH3 2.02  


______g testosterone.

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