Question

what evidence do we have that the law of conservation of mass is valid when oberving chemical reactions

Answer 1

The law of conservation the mass of the products in a chemical reaction must equal the mass of the reactants.

Answer 2

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.

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