Posted by Robin on Monday, February 18, 2013 at 11:05pm.
delta T = Kf*m
molality = mols/kg solvent.
I think the easy way to do this is to make up a number for the molar mass of the solute. It doesn't matter what number is used since it is the same in both solvents. I think 10 is a good number.
m for t-butanol is (0.27/10)/0.027 = 0.98 or so but you can do it more accurately.
Then m for cyclohexane is
(0.23/10)/0.0248 = 0.93 or so.
Which of those times Kf will produce the larger delta T value.If your prof is picky about significant figures you want to be careful with the explanation part and not use too many s.f.
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