Why are coefficients used in mole ratios instead of subscripts
3 answers
subscripts indicate how many of one molecule is needed in a given compound or solution. The coefficent indicates the number of moles of each compound. For example 2C2 is not the same as C4. 2C2 says we need two moles of C2. C4 is a different compound.
To add to an already good answer, remember that the reaction is between moles of reagents and not individual elements.
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1 answer