a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, th

Question

a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, the boiling point increased by 0.5 degrees C. If the Kbp of the solvent is 0.512 K/m, calculate the molar mass of the unknown solute.

b) When 11.5 g of an unknown, non-volatile, non-electrolyte, X was dissolved in 100 g if benzene, the vapor pressure of the solvent decreased from 100 torr to 87.3 torr at 299 K. Calculate the molar mass of the solute X.

Steps/ formulas used and explained would be nice. I'm more interested in the set up than the solution so a good step-by-step is better than an exact answer. Thanks guys!

Explanation / Answer

a)

dTbp = Kb x m x i

where...
dTbp = change in bp = 0.5

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