What is the total number of carbon atoms in octane?

Octane is an alkane with the chemical formula C₈H₁₈. The "C" in the formula indicates that there are 8 carbon atoms in one molecule of octane. This is characteristic of alkanes, which follow the general formula CₙH₂ₙ₊₂. In the case of octane, "n" is 8, leading to the conclusion that there are 8 carbon atoms present. Therefore, the choice indicating that there are 8 carbon atoms is the correct answer.