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# What is the chemical formula for petrol and diesel?

Last updated date: 27th Mar 2023
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Hint: We know that petrol and diesel are used as fuel in various vehicles such as cars, trucks, motorbikes, etc. They are used in various machineries. We get petrol and diesel from a source called petroleum.

Now let’s talk about its chemical composition. As we have learned above, petrol consists of hydrocarbons. Now the hydrocarbons have carbon atoms from $5$ to $12$ per molecule. But it is not fixed as petrol is blended as per the need. A typical petrol is a mixture of various chemicals such as paraffin, olefins and naphthalene. Petrol has a basic chemical formula since it is a mixture of various chemicals and is also blended as per its need. So, it’s general chemical formula is ${C_n}{H_{2n + 2}}$.
Now let’s talk about its chemical composition. Diesel is also a mixture of various hydrocarbons (aliphatic or aromatic). Diesel is a mixture of $25\%$ of aromatic hydrocarbons such as alkyl benzenes and naphthalene and $75\%$ of saturated hydrocarbons such as paraffin. Its chemical formula is ranging from ${C_{10}}{H_{20}} - {C_{15}}{H_{28}}$.