A solute, which has i = 5, is placed in 5430 g of nitrobenzene. If the freezing point is lowered to 3.29°C...

A solute, which has i = 5, is placed in 5430 g of nitrobenzene. If the freezing point is lowered to 3.29°C and the mass of the solute is 37.8 g, find the molecular weight.

Answer:
kf for nitrobenzene is 8.10
delta T = i x m x kf
3.29 = 5 x m x 8.10
m = 0.0812
m = moles solute / 5.430 Kg
moles solute = 0.0812 x 5.430 = 0.441
37.8 g / 0.441 = 85.7 g/mol
i dont know what the i=5 means, but I got 24.2g/mol

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