How can I balance decomposition reactions?
You balance decomposition reactions just like any other reaction. Add coefficients in front of each formula so that the number of atoms of each element are the same on both sides, being careful not to change formulas by changing subscripts.
For example, let's look at the decomposition of magnesium oxide into magnesium and oxygen.
Notice that the number of oxygen atoms is not the same on both sides. If we write a coefficient of 2 in front of the
However, now the
We now have 2