Which of the following chemical equations is balanced?
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A.
2H₂ + O₂ → 2H₂O
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B.
H₂ + 2O₂ → 2H₂O
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C.
H₂ + O₂ → H₂O
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D.
H₂O + O₂ → H₂O₂
Correct Answer:
A. 2H₂ + O₂ → 2H₂O
Explanation:
The correct answer is Option A: 2H₂ + O₂ → 2H₂O.
A chemical equation is balanced when the number of atoms for each element is identical on both the reactant and product sides, satisfying the law of conservation of mass. In this specific equation, there are four hydrogen atoms and two oxygen atoms on the left side (2H₂ and O₂). On the right side, the two molecules of water (2H₂O) also contain a total of four hydrogen atoms and two oxygen atoms. Because the atom counts for both elements are equal on both sides of the arrow, this equation is correctly balanced. The other provided options are unbalanced because they have unequal numbers of atoms between the reactants and the products.
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