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To add atoms into a formula so that a chemical reaction will end with the same amount of atoms from the beginning.

Ex. CH4 + 2O2 --> CO2 + 2H2O

The law of conservation of mass states that matter cannot be created or destroyed, so if you end with CO2, all other atoms that were present before the reaction must also be present in the "after" formula; you have to add to either side so that there will be the same amount of atoms on both sides.

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11y ago

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