Asked by gaby

A solution of LiCl in water is 18.0 wt% LiCl. What is the mole fraction of LiCl?
Answered by DrBob222
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<sub>LiCl</sub> = moles LiCl/total moles.
Answered by gaby
ok i did that and got 0.0933 is this correct?
Answered by gaby
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?
Answered by DrBob222
Yes, X<sub>LiCl</sub> = 0.085
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