7. Prestone, (ethylene glycol, antifreeze, HOCH2CH2OH) is the liquid dissolved in water used in automobile cooling #7) systems. Find the vapor pressure of a 2.000 L solution that was prepared by mixing equal volumes of antifreeze and water together at 100oC. Assume this solution obeys ideal conditions (Raoult’s). hint: You will need to find the density for each solute & solvent present in solution & water at 100oC.

The approach applied is raoult's law of ideal solution which says that the vapor pressure of a solvent in a solution is equal to the vapor pressure of the pure solvent multiplied by the mole fraction in the solution.

Mathematically, pA = NA x P'A

pB = NB x p'B

And, pT = pA + pB, not all liquids obey raoult's law, the mixtures which obey roault's law are called IDEAL SOLUTIONS.

The step by step calculations is shown in the attachment