Vitamin K is involved in normal blood clotting. When 2.32 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 7.78 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar mass of vitamin K.

Answer 1

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

m = mols/kg solvent
Substitute and solve for mols.

mols = grams/molar mass. You have mols and grams, solve for molar mass.