Can anyone help me with balancing equations?

How do you balance equations? These are the questions:

1) Sodium + Water > Sodium Hydroxide + Hydrogen
2) Ammonia + Oxygen > Nitrogen +Water
3) Sulphur dioxide + sodium hydroxide > sodium sulphite + water

- _N2 + _H2 > _NH3
- _Cu(NO3)2 > _CuO + _NO2 + _O2

1) 2Na+2Water>2NaOH+Hydrogen
hope it helps!
2Na + 2H2O --> 2NaOH + H2
4NH3 + 3O2 --> 2N2 + 6H2O
SO2 + 2NaOH --> Na2SO3 + H2O

N2 + 3H2 --> 2NH3
2Cu(NO3)2 --> 2CuO + 4NO2 + O2

The answers post by the user, for information only, does not guarantee the right.

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