# What is the composition of petrol?

Usually, we treat it as hexanes, ${C}_{6} {H}_{14}$, or as octane, ${C}_{8} {H}_{18}$.
$\text{Petrol}$ is the term used in the UK and commonwealth countries, $\text{gasoline}$ is the term used in North America. The petrol you buy for your motor is a formulation, and contains several compounds including butane, and even molecules as large as ${C}_{10}$ and ${C}_{12}$; alkanes, olefins, and some ethers are present. The presence of the smaller alkanes gives petrol a low flash point, and if you ever see someone smoking at a gas station you walk away.......