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3 November, 16:15

What is the mass of bromine in 11.2g of MgBr2?

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  1. 3 November, 17:19
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    9.72 grams of Br

    Explanation:

    This is the salt: MgBr₂ (Magnesium bromide)

    1 mol of MgBr₂ has 1 mol of Mg and 2 mol of Br

    Molar mass MgBr₂ → 184.11 g/m

    So the rule of three will be:

    184.11 g of salt have 2 moles of Br

    11.2 g of salt have (11.2. 2) / 184.11 = 0.122 moles of Br.

    Molar mass Br = 79.9 g/m

    Mol. molar mass = mass → 0.122 m. 79.9 g/m = 9.72 g
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