The combustion reaction for C5H8O2 (which is likely a ketone or an aldehyde) involves reacting it with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). Here's how to balance the equation:

1. Write the unbalanced equation:

C5H8O2 + O2 → CO2 + H2O

2. Balance the carbon atoms:

There are 5 carbon atoms on the left side and 1 on the right. To balance, add a coefficient of 5 in front of CO2:

C5H8O2 + O2 → 5CO2 + H2O

3. Balance the hydrogen atoms:

There are 8 hydrogen atoms on the left and 2 on the right. To balance, add a coefficient of 4 in front of H2O:

C5H8O2 + O2 → 5CO2 + 4H2O

4. Balance the oxygen atoms:

There are 2 oxygen atoms on the left and 14 on the right. To balance, add a coefficient of 6 in front of O2:

C5H8O2 + 6O2 → 5CO2 + 4H2O

The balanced equation is:

C5H8O2 + 6O2 → 5CO2 + 4H2O