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14 December, 15:42

Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01 g/mL.)

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  1. 14 December, 16:18
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    Molarity = 8.89 mol/L

    Explanation:

    Given dа ta:

    Mass of hydrogen peroxide = 3%

    Density = 1.01 g/mol

    Molarity = ?

    Solution:

    3% hydrogen peroxide means 3 g of H₂O₂ are present in 100 g of solution.

    Now we will calculate the moles of H₂O₂.

    Number of moles = mass / molar mass

    Number of moles = 3g / 34 g/mol

    Number of moles = 0.88 mol

    Now we calculate the volume of solution.

    d = m/v

    v = m / d

    v = 100 g / 1.01 g / mL

    v = 99 mL

    In Litter

    v = 99 / 1000 = 0.099 L

    Molarity:

    Molarity = number of moles / volume in L

    Molarity = 0.88 mol / 0.099 L

    Molarity = 8.89 mol/L
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