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Co-efficients are written in a chemical equation to balance the equation. this is due to the conservation of mass seeing how we can't make substances out of nothing.

For Example.

NaOH + H2SO4 --> Na2SO4 + H2O

As you can see on the left side, there is only one Na (sodium) atom, but on the right hand side we have 2. meaning that an extra sodium atom appeared from no where and this VIOLATES the conservation of mass. so we must balance is

2NaOH+H2SO4 --> Na2SO4 + 2H2O

There are 2 Na on both sides

There is 1 sulfur (s) on both sides

there is 4 H on both sides

and 6 oxygen on both sides.

Hope this helps :D

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14y ago

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