Multiple Choice
In the balanced chemical equation Fe + H_2O → FeO + H_2, how many atoms of hydrogen are present on the product side?
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
Which of the following is the correctly balanced chemical equation for the combustion of magnesium?
A
Mg + O_2 → MgO_2
B
2 Mg + O_2 → Mg_2O_2
C
2 Mg + O_2 → 2 MgO
D
Mg + O_2 → MgO
Verified step by step guidance1
Identify the reactants and products in the combustion reaction of magnesium. Magnesium (Mg) reacts with oxygen (O_2) to form magnesium oxide (MgO).
Write the unbalanced chemical equation: \(\mathrm{Mg} + \mathrm{O}_2 \rightarrow \mathrm{MgO}\).
Balance the magnesium atoms by ensuring the same number of Mg atoms on both sides. Since Mg appears as a single atom on the left and in MgO on the right, start by placing a coefficient of 2 in front of Mg on the left: \(2 \mathrm{Mg} + \mathrm{O}_2 \rightarrow 2 \mathrm{MgO}\).
Balance the oxygen atoms. On the left, oxygen is in O_2 molecules (2 atoms), and on the right, each MgO contains 1 oxygen atom. With 2 MgO units, there are 2 oxygen atoms on the right, which matches the 2 oxygen atoms in O_2 on the left.
Confirm that the equation is balanced with 2 Mg atoms and 2 oxygen atoms on both sides, resulting in the balanced equation: \(2 \mathrm{Mg} + \mathrm{O}_2 \rightarrow 2 \mathrm{MgO}\).
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