Chemistry

Question

Calculate the mole fraction of cai2 in an aqueous solution prepared by dissolving 0.400 moles of cai2 in 850.0 g of water.

1 Answer

  • 1) Formulas:

    a) mole fraction of component 1, X1

    X1 =  number of moles of compoent 1 / total number of moles

    b) Molar mass = number grams / number of moles => number of moles =  number of grams / molar mass


    2) Application

    Number of moles of CaI2 = 0.400

    Molar mass of water = 18.0 g/mol

    Number of moles of water: 850.0 g / 18.0 g/mol = 47.22 mol

    Total number of moles = 0.400 + 47.22 =47.62

    Molar fraction of CaI2 = 0.400 / 47.62 = 0.00840
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