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1. The sum of the masses on the reactant side must equal

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The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. ... The atoms in the reactants are shown on the left side of the equation. The atoms in the products are shown on the right side of the equation. No atoms are created or destroyed.

User Scott Boettger
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the sum of the masses on the reactant side
User Dennislloydjr
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