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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.