A sample of an organic compound (a nonelectrolyte) weighing 1.35 g lowered the freezing point of 10.0 g of benzene by 3.66 °C. Calculate the molar mass of the compound.
Lowering in freezing point = ( kf ) .m
3.66 = ( 1.86 ) × ( 1.35× 1000 / M × 10 )
M = 68.67 g / mol .
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