Question

PLEASE HELP WILL GIVE BRAINLIEST

C8H18 + O2à CO2 + H2O is the unbalanced combustion reaction between octane and oxygen. What is the coefficient for carbon dioxide in the balanced equation?

A.2
B.8
C.16
D.18

Answer 1

Answer:

16. Option c.

Explanation:

The reaction is:

C₈H₁₈ + O₂  →  CO₂ + H₂O

Let's count, we have 8 C, 18 H and 2 O in reactant side

We have 1 C, 2 H and 3 O  in product side

In order to balance the C, we add 8 to CO₂ and to balance the H, we add a 9 to H₂O

Now we have 8 C on both sides and 18 H On both sides. Finally we have 25 O on product side.

C₈H₁₈ + O₂  →  8CO₂ + 9H₂O

To balance the O in product side we must add 25/2, but as it is a rational number, we must multiply x2 to get an integer number (x2 in all the stoichiometry). The balanced reaction is :

2C₈H₁₈ + 25O₂  →  16CO₂ + 18H₂O

with 16 C, 36 H and 50 O, on both sides

Answer 2

Option C. The answer would be 16 because you gave to have 8 infront of CO2 and 9 infront of H2O. but to equal it out you need 12.5 infront of O2, but you can not have a decimal or fraction so you need to multiply the whole equation by 2. and get 2,25,16,18.