What volume of carbon dioxide, CO₂(g), in dm³, is produced when 1 dm³ of octane, C₈H₁₈(g), undergoes complete combustion?

$${\text{2}}{{\text{C}}_8}{{\text{H}}_{18}}({\text{g)}} + {\text{25}}{{\text{O}}_2}({\text{g)}} \to {\text{16C}}{{\text{O}}_2}({\text{g)}} + {\text{18}}{{\text{H}}_2}{\text{O}}({\text{g)}}$$

A.     1

B.     4

C.     8

D.     9

C

Many commented that this question, as written, is impossible without more data. Regrettably the state symbol for octane was incorrect and should have been (g). Even so, 84% of the candidates gave the “correct” answer as this was clearly the only “best choice”. The question will be corrected in the published version.