The representation of a chemical reaction in the size of substances is known as a chemical equation. The equation in which the number of atoms of all the molecules is equal on both sides of the equation is known as a balanced chemical equation.

The Law of conservation of mass governs the balancing of a chemical equation.According to this law, mass can neither be created nor be destroyed in a chemical reaction và obeying this law total mass of the elements or molecules present on the reactant side should be equal to the total mass of elements or molecules present on the sản phẩm side.

(a) HNO3 + Ca (OH)2 → Ca (NO3)2 + H2O

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