How do you balance equations?

1) firstly have count atoms on each side of arrow , check if equal. use first equation used example:

l r
2 hydrogens 2 hydrogens
2 oxygens 3 oxygens

can see not balance.

2) have add numbers front of compound adjust amount, can never adjust latter number affects actual composition.

best way find 2 imbalanced atoms (oxygen) , find common factors, 6 number.

3) multiply each equation make 4 oxygen atoms in total.

2h2o2 = 2h2o + o2

how balance chemistry equations? like, h2o2 → h2o + o2, or fe + o2 → fe2o3?

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