Acombustion reaction involves the reaction of a substance with oxygen gas. the complete combustion of any hydrocarbon (binary compound of carbon and hydrogen) produces carbon dioxide and water as the only products. octane is a hydrocarbon that is found in gasoline. complete combustion of octane produces 8 l of carbon dioxide for every 9 l of water vapor (both measured at the same temperature and pressure). what is the ratio of carbon atoms to hydrogen atoms in a molecule of octane?

Explanation:

First, we need to write the balanced equation of the combustion of octane, which is an alkane (has only hydrogen and carbons and saturated bonds), that has molecular formula CnH2n, so for n = 8: C₈H₁₈.

C₈H₁₈ + (25/2)O₂ → 8CO₂ + 9H₂O

Because of the pressure and temperature remains constant, volume is equal to the number of atoms. So, carbon dioxide has 1 atom of C, and water has two atoms of H, then:

It's proven by the molecular formula of octane showed above.

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