delta T = i*Kf*m
We need i, Kf, m.
i = 2 for NaCl
Kf we know for water is 1.86 c/m
1.25 kg ice eventually becomes 1.25 kg water.
So we need m. m = mols/kg solvent. We have kg solvent so we need mols.
mols NaCl = grams/molar mass. You know grams and molar mass, solve for mols NaCl. Use that to solve for m and use that to solve for delta T.
Then new freezing point is 0-delta T.
a student puts 1.25 kg of ice in an ice cream maker with 350 g of rock salt. All the ice eventually becomes liquid water as the rock salt dissolves. Solve for the molality of the solution, then for its new freezing temperature.
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