February 21, 2017

Homework Help: chemistry

Posted by Anna King on Sunday, February 5, 2012 at 6:05pm.

A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound can be calculated to be

a) 57.7 g/mol
b) 124 g/mol
c) 231 g/mol
d) 62.1 g/mol
e) 115 g/mol

bet its e

chemistry - DrBob222, Friday, February 3, 2012 at 6:34pm
If you were betting you lost.
delta T = i*Kf*m
You know dT, i = 1, and Kf. Solve for molality.
Molality = moles/kg solvent.
You have m and kg solvent, solve for moles.

moles solute = n = grams solute/molar mass solute.
You know moles and grams, solve for molar mass.

still lost :(

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