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16 August, 21:52

An aqueous solution that is 20.0 percent sulfuric acid (h2so4) by mass has a density of 1.105 g/ml. determine the molarity of the solution.

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  1. 17 August, 00:41
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    The definition of molarity is:

    Molarity = moles of solute / total volume of solution in Liters

    In this case, our solute is Sulfuric Acid. To solve this problem, let us assume a basis for calculation.

    Let us say that,

    Total mass of solution = 100 g

    Therefore mass of H2SO4 = 20 g

    The molar mass of H2SO4 = 98.079 g / mol

    Calculating for number of moles of H2SO4:

    number of moles = 20 g / (98.079 g / mol)

    number of moles = 0.204 mol

    Calculating for the volume of solution using the density:

    total volume of solution = 100 g / (1.105 g / mL)

    total volume of solution = 90.50 mL = 0.0905 L

    Therefore the molarity is:

    Molarity = 0.204 mol / 0.0905 L

    Molarity = 2.2542 mol / L

    Molarity = 2.25 M
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