The chemical equation of magnesium and nitric acid with balancing process

Mg + HNO3 -> Mg(NO3)2 + H2

On reactants side:

Mg=1

H=1

N=1

O=3

On products side:

Mg=1

H=2

N=2

O=6 (3×2)

Therefore to balance the equation, we must add 2 to HNO3 on the reactants side...

Mg + 2HNO3 -> Mg(NO3)2 + H2

Reactants:

Mg=1

H=2

N=2

O=6

Therefore, it's balanced.

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