Question

calculate the mole fraction of ethylene glycol in a solution containing 20% of ethylene glycol prepared in water.
answer it as fast as possible.........

Answer 1

Are you talking about 20% w/w/ or 20% w/v? I will assume you mean 20% w/w which means 20 g ethylene gycol in 100 g solution. So that is 20 g ethylene glycol in 80 g H2O.
n H2O = g/molar mass = ?
n ethylene glycol = grams/molar mass = ?
total mols = n H2O + n ethylene gycol
Xeth gly = n eth gly/total mols.