Posted by paul on Wednesday, January 12, 2011 at 7:38am.
For a.
moles NaCl = grams/molar mass = 21.1g/58.44 = ??
molality = moles/kg solvent = ??moles/0.135 g H2O = xx
Then delta T = i*Kf*m
i = 2; Kf = 1.86; m = xx
This will give you delta T and from that and knowing H2O usually freezes at 0C, calculate freezing point of the solution.
part b is done the same way; however, i = 1.
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