The complete combustion of octyne has the form of the following equation:
To balance the equation, we need to count the atoms of each element before and after the reaction occurs. If this number is the same for each type of atom, the reaction is balanced.
Let's start counting:
As you can see, the reaction is not balanced. To balance, we could change the coefficients of each compound in order to count again a lot of times. Doing this, the balanced reaction would be:
The coefficient in front of O2 when the reaction is properly balanced is 23.