what is the molecular formula of petrol?

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You mean "gasoline", right?   In North America, the term "gasoline" is often shortened in colloquial usage to "gas", whereas most current or former 'Commonwealth nations' use the term "petrol". (in case the terminological use might get confusing for others)   So, "gasoline" consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. Some gasolines also contain ethanol as an alternative fuel.   Hope that helps.