A solution of LiCl in water is 18.0 wt% LiCl. What is the mole fraction of LiCl?

Answer 1

18% LiCl means 18 g LiCl/(18 g LiCl+ 82 g H2O)
moles LiCl = 18 g/molar mass.
moles H2O = 82 g/molar mass.

X_LiCl = moles LiCl/total moles.

Answer 2

ok i did that and got 0.0933 is this correct?

Answer 3

mmm so i did Licl molar mass is 42.394
18/42.394=.425 moles of LiCl
then water is 18.0152
82/18.0152=4.55 moles of H2O
so .425+4.55=4.98
(.425)/(4.98)=.0853 <---mole fraction of LiCl

ok so is this right now?

Answer 4

Yes, X_LiCl = 0.085