Question

why do we balance the chemical equation

Answer 1

We need to make use of another coefficient in front of H2. This time, we put a coefficient of 3 in front of H2 to balance the chemical equation. The equation above is now balanced. There are 2 nitrogen (N) atoms and 6 hydrogen (H) atoms on both the reactants and products side.
We also use to balance chemical equations to satisfy the property .

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Answer 2

to follow the law of conservation of mass that number of atoms should be equal on the reactants and products side