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26 August, 05:34

A 14.1% by mass HClO3 solution has a density of 1.1690 g/mL. What is the concentration of this solution in molarity?

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  1. 26 August, 06:20
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    [ HClO₃] = 1.93M

    Explanation:

    X % by mass, means that in 100 g of solution, we have X g of solute.

    In this case, 14.1 g of HClO₃ are contained in 100 g of solution.

    Density always referrs to solution. Let's calculate the volume of solution.

    Solution density = Solution mass / Solution volume

    1.1690 g/mL = 100 g / Solution volume

    Solution volume = 100 g / 1.1690 g/mL → 86.2 mL.

    For molarity we must get moles of solute and volume of solution (L), because molarity is mol/L

    Let's convert the mL of solution in L

    86.2 mL. 1L / 1000mL = 0.0862 L

    Now, let's determine the moles of solute. (Mass / Molar mass)

    14.1 g / 84.45 g/mol = 0.167 moles

    Molarity is mol/L → 0.167 moles / 0.0862 L = 1.93M
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