The boiling point of ethanol CH3CH,OH is 78.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is testosterone. How many grams of testosterone, C19H2302 (288.4 g/mol), must be dissolved in 224.0 grams of ethanol to raise the boiling point by 0.300 °C ? Refer to the table for the necessary boiling or freezing point constant.
The boiling point of ethanol CH3CH,OH is 78.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is testosterone. How many grams of testosterone, C19H2302 (288.4 g/mol), must be dissolved in 224.0 grams of ethanol to raise the boiling point by 0.300 °C ? Refer to the table for the necessary boiling or freezing point constant.
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Transcribed Image Text:The boiling point of ethanol CH3CH,OH is 78.50°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in ethanol is
testosterone.
How many grams of testosterone, C1,H2802 (288.4 g/mol), must be dissolved in 224.0 grams of ethanol to raise the boiling point by
0.300 °C ? Refer to the table for the necessary boiling or freezing point constant.
Formula
| K, (°C/m) Kf(°C/m)
Solvent
Water
H,0
0.512
1.86
Ethanol
CH;CH,OH
1.22
1.99
Chloroform
CHC13
3.67
Benzene
2.53
5.12
Diethyl ether CH3CH2OCH2CH3
2.02
g testosterone.
Expert Solution
Given
Number of grams of ethanol given = 224.0 g
Molar mass of testosterone = 288.4 g/mol
Elevation in boiling point required, = 0.300 oC
Elevation in boiling point constant for ethanol, Kb = 1.22 oC/m
Elevation in boiling point and calculation of molality
According to the colligative property of elevation in boiling point -
where, m = molality of the solution
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