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General chemistry

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

  • General chemistry -

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

    XLiCl = moles LiCl/total moles.

  • General chemistry -

    ok i did that and got 0.0933 is this correct?

  • General chemistry -

    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?

  • General chemistry -

    Yes, XLiCl = 0.085

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