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1 May, 10:18

What is the molality of a solution in which 0.32 moles AlCl3 has been dissolved in 2,200 g water? What mass of water is needed to prepare a 1.20 molal solution using 0.60 mol propyleneglycol? What is the molality of a solution in which 0.145 mol CO2 is dissolved in 591 g water?

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  1. 1 May, 10:35
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    1) The molality is 0.145 molal

    2) We need 0.50 kg water

    3) The molality is 0.245 molal

    Explanation:

    What is the molality of a solution in which 0.32 moles AlCl3 has been dissolved in 2,200 g water?

    Molality = moles AlCl3 / mass water (in kg)

    Molality = 0.32 moles / 2.2 kg water

    Molality = 0.145 moles/kg = 0.145 molal

    The molality is 0.145 molal

    What mass of water is needed to prepare a 1.20 molal solution using 0.60 mol propyleneglycol?

    Molality = moles propyleneglycol / mass water

    1.20 = 0.60 / x kg

    X = 0.60 / 1.2

    X = 0.50 kg water

    We need 0.50 kg water

    What is the molality of a solution in which 0.145 mol CO2 is dissolved in 591 g water?

    Molality = moles CO2 / mass water (in kg)

    Molality = 0.145 moles / 0.591 kg

    Molality = 0.245 molal

    The molality is 0.245 molal
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