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When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

1. C9H9
2. C8H6
3. C8H16
4. C9H6

Correct answer: C8H6

Solution

The combustion of a hydrocarbon can be represented by the equation CxHy + O2 → CO2 + H2O. Given that 9.5 equivalents of oxygen are required and 3 equivalents of water are produced, we can deduce the ratio of carbon to hydrogen in the hydrocarbon. The correct molecular formula C8H6 indicates that for every 8 carbon atoms, there are 6 hydrogen atoms, which aligns with the stoichiometry of the combustion reaction.

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