Calculate the freezing point of a solution contaning 5.0 grams of KCl and 550.0 grams of water.

answer is -0.45 C but i don't know how to get here

1 answer

KCl breaks into two particles, two ions.

deltaTf=kf*2*molesKCl/.55 kg solvent

moles KCl=5/74.5

deltaTf== -1.86*2*5/74.5*1/.55 = -.45C