delta T = 7.5
i, the van't Hoff factor for KCl is 2.
delta T = i*Kf*molality
Substitute for delta T, i, and Kf (1.86) and solve for m.
Then m = mols/kg solvent. Substitute for m and kg solvent; solve for mols.
Then mol = grams KCl/molar mass KCl. You know molar mass and mols, solve for grams.
How many grams of KCl should be added to 1.5kg of water to lower its freezing point to -7.5°C
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