State the law of conservation of mass.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Concept**: The law of conservation of mass is a fundamental principle in chemistry that relates to the mass of substances involved in chemical reactions.

2. **Definition**: The law states that in an isolated system, mass is neither created nor destroyed during chemical reactions or physical transformations. This means that the total mass of the reactants (the substances that undergo the reaction) is equal to the total mass of the products (the substances that are formed).

3. **Implication**: This principle implies that during any chemical reaction, the mass of the substances before the reaction (reactants) will be the same as the mass of the substances after the reaction (products).

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