How do you balance Mg + HNO3 -->Mg(NO3)2 + H2?

The balanced equation can be written as Mg + 2HNO3 → Mg(NO3)2 + H2

Magnesium + Nitric acid → Magnesium nitrate + Hydrogen gas

There are 2 molecules of nitric acid each acid has one hydrogen so two molecules of nitric acid is 2 hydrogens. There are 2 molecules of nitric acid each acid has one nitrogen so two molecules of nitric acid is 2 nitrogens. There are 2 molecules of nitric acid each acid has 3 oxygens so two molecules of nitric acid is 6 oxygens.

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