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28 September, 12:36

A solution is prepared by dissolving 17.75 g sulfuric acid, h2so4, in enough water to make 100.0 ml of solution. if the density of the solution is 1.1094 g/ml, what is the molality?

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  1. 28 September, 16:27
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    When density = 1.1094 g / ml = 1.1094 Kg / L &

    the volume of solvent = 100m/1000=0.1 L

    weight of solvent = denisty x volume = 1.1094 kg/L * 0.1 L = 0.111 Kg

    ∴ molality = no. of moles of solute / Kg of solvent

    we need to get the no. of moles of the solute = weight of solute/molar mass

    = 17.75 / 98 = 0.18

    by substitution in molality equation:

    ∴ molality = 0.18 / 0.111 = 1.62 mol/kg
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