80. What is the vapor pressure of a aqueous solution containing 10 % (by weight) ethylene glycol (62 g/mol) at 25 °C. PH2O = 24.3 torr at 25°C?

Answer 1

Let's call ethylene glycol ethg for this problem.
10% w/w ethg means 10 g ethg in 90 g H2O.
mols ethg = grams/molar mass = 10/62 = 0.16
mols H2O = 90/18 = 5
total mols = 5.16
X_ethg = mols ethg/total mols = 0.16/5.16 =0.031
P_solution = X_solute*P^o_solvent
P_solution = 0.031*24.3 = ?
Post your work if you get stuck.