Posted by Melanie on .
Assuming complete dissociation of the solute, how many grams of KNO_3 must be added to 275mL of water to produce a solution that freezes at 14.5C? The freezing point for pure water is 0.0 C and K_f is equal to 1.86 C.
Delta T= Kf*m*i
i=2
m=3.90
solvent 275=.275L
Moles=1.07
Can anyone help plz? Stuck

Chemistry 
DrBob222,
moles = grams/molar mass
You have moles and molar mass. Calculate grams.