Why is it incorrect to write a chemical formula for petrol?

Crude oil and petroleum fossil fuels because they are mixtures of hydrocarbons that formed from the remains of animals and plants. The word petroleum means rock oil or oil from the earth. Petroleum products are fuels made from crude oil and hydrocarbons contained in natural gas. Petroleum products can also be made from coal, natural gas, and biomass. Composition of Petrol: Hydrocarbons atoms from 4 to 12 carbon atoms per molecule, called C4-C12. It is mixture of paraffins (Alkanes), Olefins (Alkenes) and cycloalkanes (naphthenes). The standard chemical formula for petrol is CnH2n+2. This formula refers to alkanes, and the chemical formula for petrol can be altered when it consists of different gases

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