What mass of magnesium oxide is formed when 4.8 g of magnesium burns completely in oxygen (Mg = 24, O = 16)?
Correct answer C. 8.0 g
Explanation
2Mg + O₂ → 2MgO, so moles of MgO equal moles of Mg = 4.8/24 = 0.20 mol. Mass of MgO = 0.20 × 40 = 8.0 g.
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