The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.50°C at 1 atmosphere. A n

Question

The boiling point of diethyl ether CH3CH2OCH2CH3 is 34.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in diethyl ether is testosterone How many grams of testosterone, C19H2802 (288.4 g/mol), must be dissolved in 264.0 grams of diethyl ether to raise the boiling point by 0.450 °C? Refer to the table for the necessary boiling or freezing point constant Formula Kb (C/m) Kf (°C/m) Solvent Water Ethanol Chloroforn Benzene 0.512 1.86 1.22 3.67 2.53 2.02 CH3CH2OH CHCI CoH6 1.99 5.12 Diethyl ether CH3CH20CH2CHz gtestosterone

Explanation / Answer

use:
? Tb = Kb*mb
0.45 = 2.02 *mb
mb= 0.2228 molal


mass, m = 2.64*10^2 g
= 0.264 kg

use:
molality = mass of solute/(molar mass of solute * mass of solvent in Kg)
0.2228 = massOfSolute/(288.4*0.264)
massOfSolute = 16.9613 g
Answer: 16.96 g

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