Q
QuestionChemistry

Explain why oxygen gas must be written as O^2 in a chemical equation.
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Answer

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Step 1
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To understand why oxygen gas is written as O^2 in a chemical equation, it is essential to know that oxygen is a diatomic molecule. This means that one molecule of oxygen consists of two oxygen atoms chemically bonded together.

Step 2
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In a chemical equation, we represent the actual number of atoms of each element involved in a reaction. Therefore, when writing an equation for a reaction involving oxygen, we need to account for the fact that each oxygen atom exists as part of an O^2 molecule.

Final Answer

Oxygen gas is written as O^2 in a chemical equation because oxygen exists as a diatomic molecule, with two oxygen atoms chemically bonded together. This notation ensures that chemical equations accurately represent the actual number of atoms of each element involved in a reaction.