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16 June, 19:46

A potassium bromide solution is 8.30 % potassium bromide by mass and its density is 1.03 g/mL.

What mass of potassium bromide is contained in 41.2 mL of the solution?

3.52 g

3.32 g

5.11 g

3.42 g

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  1. 16 June, 20:11
    0
    3.52 g.

    Explanation:

    The density of potassium bromide solution is 1.03 g/mL, which means that the mass of 1.0 mL of the solution is 1.03 g.

    Using cross multiplication:

    1.0 mL of potassium bromide solution weigh → 1.03 g.

    41.2 mL of potassium bromide solution weigh →? g.

    ∴ The mass of 41.2 mL of potassium bromide solution = (41,2 mL) (1.03 g) / (1.0 mL) = 42.436 g.

    ∴ The mass of potassium bromide in the solution = the mass of the solution x weight fraction of potassium bromide = (42.436 g) (0.083) = 3.52 g.
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