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In a balanced chemical equation, what is done with a coefficient of 1?
AIt is written as a subscript
BIt is placed after the formula
CIt is normally left out entirely
DIt is placed above the arrow
Answer & Solution
Correct answer: C. It is normally left out entirely
1. A coefficient is the number placed immediately to the left of a formula.
2. It states how many units of that species take part.
3. A coefficient of 1 is understood, so it is normally omitted rather than written.
4. Subscripts belong inside a formula and describe the substance itself, so a coefficient never moves there.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_
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