Homework Help: Chemistry

Posted by Anna on Saturday, February 2, 2013 at 11:39pm.

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.

Chemistry - DrBob222, Saturday, February 2, 2013 at 11:42pm
Freezing point is supposed to go down. It went up. Bad data. Means nothing to me.
Chemistry - Anna, Saturday, February 2, 2013 at 11:53pm
If it had gone down then how would we calculate it
Chemistry - DrBob222, Sunday, February 3, 2013 at 12:38am
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.

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