Calculate the normal freezing point of an aqueous solution containing 30% w/w ethylene glycol. Thanks

Answer 1

30% w/w means 30 g ethylene glycol/100 g soln or 30 g ethyl glycol/(30g eth + 70g H2O).
Convert 30 g ethylene glycol to moles. moles = grams/molar mass
Calculate molality of the solution. That will be molality = moles/kg soln.

Then delta T = Kf*m
Solve for delta T and subtract from 0 C.