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6 June, 14:03

When 0.313 g of Mg is heated strongly in a nitrogen (N2) atmosphere, a chemical reaction occurs. The product of the reaction weighs 0.433 g. Calculate the empirical formula of the compound containing Mg and N. Name the compound.

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  1. 6 June, 15:19
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    Mg₃N₂ (magnesium nitride)

    Explanation:

    M (total) = M (mg) + M (n)

    M (n) = M (total) - M (mg)

    = 0.433g - 0.313g

    = 0.12g

    mole (N) = 0.12g / 14.0067 g/mol

    = 0.008567

    mole Mg = 0.313g / 24.3050 g/mol

    = 0.012878

    Mg = 0.012878 / 0.008567

    = 1.5

    N = 0.008567 / 0.008567

    = 1

    multiply by 2 to get whole numbers

    Mg = 1.5 * 2 = 3

    N = 1 * 2 = 2

    Mg₃N₂ (magnesium nitride)
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