Suppose you burn a substance in the air reactants and produce smoke and ash products the law of conservation of mass states that the mass of your reactants should be the mass of your products?

The law of conservation of mass states that- "mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants."

Therefore, the mass of the reactant is the same as the mass of the products.

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