How many grams of ethanol C2H5OH(1),must be added to 500.0 g of water to make a solution that freezes at0.00 F? The molal freezing point depression constant water is 1.86 C.kg/mole

Answer 1

(F-32)*5/9 = (0-32)*5/9 = -32*5/9 = about -17.8 but you need to confirm.
delta T = Kf*molality
17.78/1.86 = molality = ?
?molality = mols/kg solvent.
Plug in 0.500 for kg solvent and ?molality and solve for mols.
Then mols = grams/molar mass.
You know mols and molar mass, solve for grams.
Post your work if you get stuck.

Answer 2

I need help on knowing how to do this problem