Question

How would you balance: $Al(s) + HN{O_3}(aq) \to Al{(N{O_3})_3}(aq) + {H_2}(g)?$

Answer 1

In a balanced chemical equation, the number of moles of each atom on both sides of the equation (reactant side of the reaction and product side of the reaction) is equal.

Complete step by step answer:
The chemical reaction is defined as the reaction taking place between the reactant compounds to form a product under specific conditions like temperature, pressure, nature of solvent. The catalysts are used to enhance the speed of the reaction without interfering in the reaction.
The chemical equation is the symbolic representation of the chemical reaction which is represented in the form of symbols and formulae. In the chemical equation reactants are written in the left side of the chemical equation and the products are written in the right side of the chemical equation.
The given chemical equation is shown below.
$Al(s) + HN{O_3}(aq) \to Al{(N{O_3})_3}(aq) + {H_2}(g)$
In this reaction, aluminium reacts with nitric acid to form aluminium nitrate and hydrogen gas.
The balanced chemical equation is defined as the equation where the number of moles of each atom in reactant side (left side) and product side (right side) are the same.
The balanced chemical equation of the given reaction is shown below.
$2Al(s) + 6HN{O_3}(aq) \to 2Al{(N{O_3})_3}(aq) + 3{H_2}(g)$
In this reaction, two mole of aluminium reacts with six mole of nitric acid to form two mole of aluminium nitrate and three mole of hydrogen gas.

Atom	Number in left side	Number in right side
Al	2	2
H	6	6
N	6	6
O	12	12
Total	26	26

The number of atoms in both sides of the reaction is equal.

Note:
The balanced chemical equation follows the law of conservation of mass. The law states that the mass can neither be created or destroyed, it can only be transferred from one form to another.