Question

What is the mole fraction of solute in a 1.00 molal solution in which toluene (C7C8) is the solvent.

Answer 1

1 molal means 1 mol solute in 1 kg solvent.
mols solute = 1.00
mols solvent = 1000/18 = ?
Total mols = 1.00 + ? from above.
Then Xsolute = 1.00/total mols.