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10 April, 22:12

What is the molality of an aqueous KCl solution with a mole fraction of KCl, XKCl = 0.175? (The molar mass of KCl = 74.55 g/mol and the molar mass of H2O is 18.02 g/mol.)

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  1. 10 April, 22:42
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    The molality of the KCl solution is 11.8 molal

    Explanation:

    Step 1: Data given

    Mol fracrion KCl = 0.175

    Molar mass KCl = 74.55 g/mol

    Molar mass H2O = 18.02 g/mol

    Step 2: Calculate mol fraction H2O

    mol fraction H2O = 1 - 0.175 = 0.825

    Step 3: Calulate mass of H2O

    Suppose the total moles = 1.0 mol

    Mass H2O = moles H2O * molar mass

    Mass H2O = 0.825 * 18.02 g/mol

    Mass H2O = 14.87 grams = 0.01487 kg

    Step 4: Calculate molality

    Molality KCl = 0.175 / 0.01487 kg

    Molality KCl = 11.8 molal

    The molality of the KCl solution is 11.8 molal
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