Posted by Colin on .
assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at 14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .

Chemistry 
DrBob222,
delta T = i*Kf*m
where i = 2, solve for m.
m = moles/kg solvent
Solve for moles.
moles = g/molar mass
solve for grams.