Question

In the following unbalanced chemical reaction, what belongs in the blank? C8H18 + O2à CO2 + H2O + _________ A. CO B. CO3 C. energy D. nothing

Answer 1

Answer:

C. energy

$2C8H18 + 25O2 \rightarrow 16CO2 + 18H2O + energy$

Explanation:

The balanced reaction is:

$2C8H18 + 25O2 \rightarrow 16CO2 + 18H2O$

This is essentially a combustion reaction in which a hydrocarbon such as octane in this case, reacts with oxygen to form carbon dioxide and water. Combustion reactions are exothermic  which implies that energy is released as the reaction progresses. Thus, the given reaction can be represented by adding the term 'energy' to the product side of the reaction:

$2C8H18 + 25O2 \rightarrow 16CO2 + 18H2O + energy$

Answer 2

Your answer is C energy hope it helps:)