Homework Help: Chemistry

Posted by Melanie on Wednesday, February 24, 2010 at 7:31pm.

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, Wednesday, February 24, 2010 at 7:34pm
moles = grams/molar mass
You have moles and molar mass. Calculate grams.

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