delta T = K*m
substitute and solve for m
m = mols/kg solvent. You have kg solvent (500 mL = 500 g if density is 1.0 g/mL, and 500 g = 0.500 kg.) and m, solve for mols solute.
Then mols solute = grams/molar mass. You have molar mass and mols, solve for grams C2H5OH.
How much ethyl alcohol, C2H5OH must be added to 500mL of water so that the solution will freeze at -10C? KfH2O = 1.86 C/molal
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