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4 September, 17:25

Calculate the molality of a solution prepared by dissolving 175 g of KNO3 in 750 g of water. (round to nearest hundreth)

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  1. 4 September, 17:33
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    We will get the molality from this formula:

    Molality = no. of moles of solute / Kg of solvent

    So first we need the no. of moles of KNO3 = the mass of KNO3 / molar mass of KNO3

    no. of moles of KNO3 = 175 / 101.01 = 1.73 mol

    By substitution in the molality formula:

    ∴ molality = 1.73 / (750/1000) = 2.3 Molal
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