To balance the chemical equation for the reaction of magnesium and oxygen to form magnesium oxide, follow these steps:
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Write the unbalanced equation: \[ \text{Mg} + \text{O}_2 \rightarrow \text{MgO} \]
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Count the number of each type of atom on both sides:
- Reactants: 1 Mg, 2 O (from O₂)
- Products: 1 Mg, 1 O (from MgO)
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Balance the oxygen atoms: Since there are 2 oxygen atoms on the reactant side and only 1 on the product side, you'll need 2 magnesium oxide (MgO) molecules: \[ \text{Mg} + \text{O}_2 \rightarrow 2 \text{MgO} \]
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Update the counts:
- Reactants: 1 Mg, 2 O
- Products: 2 Mg, 2 O (from 2 MgO)
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Balance the magnesium atoms: Now you have 2 magnesium atoms in the products. To balance the magnesium, put a coefficient of 2 in front of Mg: \[ 2 \text{Mg} + \text{O}_2 \rightarrow 2 \text{MgO} \]
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Final check:
- Reactants: 2 Mg, 2 O
- Products: 2 Mg, 2 O
Now the equation is balanced.
The balanced equation is: \[ \boxed{2 \text{Mg} + \text{O}_2 \rightarrow 2 \text{MgO}} \]