Question

C8H18 + O2→ CO2 + H2O

Answer 1

The balanced equation is $2C_{8} H_{18} + 25O_{2} ---> 16CO_{2} + 18H_{2} O$

Explanation:

We begin by balancing the  C  and the  H  atoms first,

             $C_{8} H_{18} + O_{2} ---> 8CO_{2} + 9H_{2} O$

Now, counting the number of  O  atoms on either side;

reactant side  --->  2

product side  ----> 25

So,$C_{8} H_{18} + \frac{25}{2} O_{2} ---> 8CO_{2} + 9H_{2} O$

⇒  $2C_{8} H_{18} + 25O_{2} ---> 16CO_{2} + 18H_{2} O$