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30 March, 15:47

What mass of solute is contained in 25.4 ml of a 1.56 m potassium bromide solution?

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  1. 30 March, 16:29
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    Answer is: mass of potassium bromide is 4.71 grams.

    V (KBr) = 25.4 mL : 1000 mL/L = 0.0254 L, volume of solution.

    c (KBr) = 1.56 mol/L.

    n (KBr) = c (KBr) · V (KBr).

    n (KBr) = 1.56 mol/L 0.054 L.

    n (KBr) = 0.0396 mol, amount of substance.

    m (KBr) = n (KBr) · M (KBr).

    m (KBr) = 0.0396 mol · 119 g/mol.

    m (KBr) = 4.71 g.

    M - molar mass.
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