What mass of Magnesium oxide (MgO) is produced when 12 g of Magnesium is burned in excess Oxygen? (Ar: Mg=24, O=16)

10 g
20 g
40 g
80 g

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Reaction: 2Mg + O₂ → 2MgO. Moles of Mg = 12 / 24 = 0.5 mol. According to stoichiometry, 0.5 mol Mg produces 0.5 mol MgO. Mass of MgO = 0.5 * (24 + 16) = 20 g.

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