Suppose 1.500 g of a compound is dissolved in 35.00 g of camphor. The freezing point of pure camphor is 178.75 °C, the freezing point of the solution is 164.4 °C and Kf(camphor) = 37.7 °C*kg/mol. Assume this compound does not dissociate. What is the molecular mass of the compound? (In g/mol, do not include units)
dT = i*Kf*m
you know dT = 178.75 - 164.4 = ?
You know i = 1
You know Kf
Substitute and solve for m.
Then m = mols/kg solvent. You know kg solvent and m, solve for mols.
Then mols = grams/molar mass. You know grams and mols, solve for molar mass.
Post your work if you get stuck.