How much ethyl alcohol (C2H5OH) must be added to 1.00 L of water so that the solution will not freeze at -4°F?

2 answers

delta T = Kf*m
calculate m

m = moles/1 kg solvent
calculate moles

moles = grams/molar mass
calculate grams.

Use the density if you want to measure the ethanol by volume.
2.47