posted by Anna on .
Freezing point of pure water = -2, Freezing point of Unknown solution = -1
Mass of unknown in 50g of water = 1.9964g. Calculate the delta T for the solution of the unknown solid and determine the molecular weight of the unknown solid.
Freezing point is supposed to go down. It went up. Bad data. Means nothing to me.
If it had gone down then how would we calculate it
delta T = Kf*m
Substitute for delta T and Kf and solve for m = molality
In your case delta T is +1 and kg solvent is 0.050.
m = mols/kg solent
You have m and kg solvent; solve for mols.
mol = grams/molar mass. You have mol and grams, solve for molar mass.