Question

How many moles of antifreeze (a molecular substance) must be added per liter of water to protect the cooling system of a motocar to -30 degrees F.

delta T = Kf*m
Convert -30F to degrees C.
Substitute into the formula and solve for m. Since molality = moles/kg solvent that will be moles/L IF we assume 1 L of water has a mass of 1 kg.

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