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31 May, 14:55

An aqueous potassium chloride, KCl, solution is made by dissolving 0.295 0.295 mol KCl in 740.0 740.0 g of water. Calculate the molality of the solution.

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  1. 31 May, 17:35
    0
    Molality is 0.40 m

    Explanation:

    Molality is a sort of concentration that indicates the moles of solute dissolved in 1kg of solvent.

    To determine molality we need the moles of solute, and the mass of solvent in kg so:

    We convert the mass of solvent from g to kg:

    740 g. 1kg/1000g = 0.740 kg

    We know the moles, so we can determine molality

    Molality (mol/kg) = 0.295 mol / 0.740kg = 0.40 m
  2. 31 May, 18:44
    0
    Molality of the solution = 0.399 molal

    Explanation:

    Step 1: Data given

    Number of moles KCl = 0.295 moles

    Mass of water = 740.0 grams

    Step 2: Convert mass to kg

    740 grams = 740 * 10^-3 kg = 0.740 kg

    Step 3: Calculate the molality of the solution

    Molality of the solution = moles KCl / mass water

    Molality of the solution = 0.295 moles / 0.740 kg

    Molality of the solution = 0.399 mol / kg = 0.399 molal
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