Solvent Formula Kf value* Normal freezing Kb value Normal boiling (OC/m) point (

Question

Solvent Formula Kf value* Normal freezing Kb value Normal boiling (OC/m) point (°C) (°C/m) point (OC) 0.512 100.00 H20 1.86 0.00 C6H6 5.12 5.49 2.53 Water benzene 80.1 20.8 2.92 80.7 Cyclohexane C6H12 6.59 C2H60 1.99 -117.23 ethanol 78.4 1.22 29.8 22.9 carbon 5.03 76.8 tetrachloride Camphor C10H160 37.8 176 *When using positive Kf values, assume that ATf is the absolute value of the change in temperature. If you would prefer to define ATf as "final minus ini temperature, then ATf will be negative and so you must use negative Kf values. Either way, the freezing point of the solution should be lower than that pure solvent.

Explanation / Answer

molality of menthol=(0.375/M)/0.025=15/M

Freezing point depression=mKf=(15/M)*20.8=2.0

M=156

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