How do you find the molecular weight through freezing point?
I have 3.545 g of some unknown nonelectrolyte dissolved in 15 g of water. The extrapolated freezing point is -.56 C. How do I determine the molecular weight of the unknown nonelectrolyte?
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delta T = m x kf
0.56 = m x 1.86
m = 0.56 / 1.86 = 0.296
molaity = moles solute / Kg solvent
0.296 = moles solute / 0.015 Kg
moles solute = 0.296 x 0.015 =0.00444
molar mass = 3.545 g / 0.00444 mol = 798 g/mol