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29 July, 01:09

Calculate the molality of a solution prepared by dissolving 25.0 g of sodium chloride (NaCl) in 625 g of water

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  1. 29 July, 02:55
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    Answer: m = 0.69 m or mol/kg

    Explanation: Molality is expressed as moles per unit kilograms of solvent or m = n / kg

    First convert 25.0 g NaCl to moles

    25.0 g NaCl x 1 mole NaCl / 58 g NaCl

    = 0.43 moles NaCl

    Next convert 625 g H2O to kilograms

    625 g H2O x 1 kg / 1000 g H2O

    = 0.625 kg H2O

    Substitute the values in the formula

    m = n / kg

    = 0.43 mole NaCl / 0.625 kg

    = 0.69 m or mole / kg
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