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8 September, 21:22

Magnesium reacts with oxygen gas to form magnesium oxide. Which of the following represents the balanced chemical equation?

Mg + O2 - -> MgO

Mg + O2 - -> 2MgO

2Mg + 2O2 - -> 2MgO

2Mg + O2 - -> 2MgO

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  1. 8 September, 21:25
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    2Mg + O2 → 2MgO

    Explanation:

    Step 1: Data given

    Magnesium = Mg

    Oxygen = O2

    magnesiumoxide = MgO

    Step 2: The unbalanced equation

    Mg + O2 → MgO

    Step 3: Balancing the equation

    On the left we have 2x O so on there right, we should mulitply MgO by 2 so we have on each side 2x O

    Mg + O2 → 2MgO

    On hte right side we have 2x Mg, so we have to multiply on the left side Mg by 2 to have the same amount of Mg on both sides

    2Mg + O2 → 2MgO

    Now the equation is balanced
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