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8 August, 20:41

What is the mole fraction of NaOH in an aqueous solution that contains 15% NaOH by mass?

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  1. 8 August, 21:51
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    0.074

    Explanation:

    15% means that in 100 g of solution 15 g sodium hydroxide is present.

    Mass of water = 100 - 15 = 85 g

    Number of moles of sodium hydroxide:

    Number of moles = 15 g/40 g/mol

    Number of moles = 0.375 mol

    Number of moles of water:

    Number of moles = 85 g/18 g/mol

    Number of moles = 4.7 mol

    Moles fraction of NaOH:

    moles of NaOH / moles of solvent + moles of solute

    0.375 mol / 0.375 mol+4.7mol

    0.375 mol / 5.075 mol

    0.074
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