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A 2.00 M solution of CaCl2 in water has a density of 1.17 g/mL. What is the mole fraction of CaCl2?

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2 answers
  1. 2.00 M CaCl2 means 2 moles CaCl2/L solution. 1 L of solution has a mass of
    1.17 g/mL x 1000 mL = 1170 grams.
    How much of that is water?
    1170 - grams of CaCl2.
    Convert grams of water to moles.
    Then moles fraction CaCl2 = moles CaCl2/total moles.

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  2. 0.380

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