Question

find the freezing point of a solution containing 3 grams of a compound of molar mass 125 g/mol in 45 g of camphor

Answer 1

mols = grams/molar mass.
Substitute and solve for mols.

m = molality = mol/kg solvent
Substitute and solve for m.

delta T = Kf*m
Substitute and solve for delta T.

Then subtract delta T from the normal freezing point of camphor.