Remember: the mass of the reactants is always equal to the mass of the products. Mass cannot be created or destroyed.
Eg.
__ Fe(s) + __ O2(g) -----> __Fe2O3(g)
We must always make sure that the number of atoms of each element on one side equals the number on the other side of the arrow.
Before: After:
1 Fe 2 Fe
2 O 3 O
First balance the Oxygen.
The common multiple is 6 so you put 3 O2 and 2 Fe2O3
Now you have 6 oxygen atoms.
All that's left is the Fe(s). Because you put a 2 in front of Fe2O3, that means that Fe2 is multiplied by 2 which means you have 4 Fe. So that is what you put in front of Fe(s)
The balanced equation is... 4 Fe(s) + 3 O2-----> 2 Fe2O3
Its very simple!!!!! All it requires is logic and basic multiplication skills.
http://www.youtube.com/watch?v=RnGu3xO2h74
That is a great video that we found useful
Good luck!
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