Mg+O2-MgO

Balanced chemical equation: - Unbalanced: Mg + O2 → MgO - Balanced: 2 Mg + O2 → 2 MgO Reason: O2 provides two oxygen atoms, while MgO contains one O per formula unit, so you need 2 MgO on the product side. Check: Mg atoms 2 on both sides; O atoms 2 on both sides. State symbols (optional): Mg(s) + O2(g) → MgO(s) Quick practice (optional): - If 5.0 g Mg reacts with excess O2, how much MgO forms? - Molar masses: Mg ≈ 24.31 g/mol; MgO ≈ 40.31 g/mol - Moles Mg = 5.0 / 24.31 ≈ 0.206 mol - Moles MgO formed = 0.206 mol (stoichiometry 1:1 with Mg) - Mass MgO ≈ 0.206 × 40.31 ≈ 8.3 g Would you like me to explain another balancing example or turn this into flashcards?