Vitamin K is involved in normal blood clotting. When 1.05 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 3.53 °C. The freezing point and Kf constant for camphor can be found here. Calculate the molar mass of vitamin K.

Question

I honestly have no idea what it is that I'm doing wrong. I think my initial equation of DTf = Kf * m might be wrong, therefore throwing off the rest of the problem. Please help.

Answer 1

formula is correct, the issue is molality.

1.05/molmassK*.025

so,

molmassK=1.05Kf/(.025*3.53)