Thus we can balance the oxygen atoms by putting a prefix of 25/2 on the left side. To obtain a equation containing whole numbers, we multiply the entire equation by 2. This gives the final equation. 2 C8H18 + 25 O2 ---> 16 CO2 +18 H2O.
D is incorrect it is not a compound.
What you have to do is balance the chemical equations to make sure everything is even on both sides. If you want me to help you answer the questions comment back
Can you be more specific, I think the answer is 7.1506