Petrol is predominantly made up of octane (written as C8H18) so...

The equation for the complete combustion of octane is:

2C8H18 + 25O2 ——-> 18H20 + 16CO2

2 Octane molecules + 25 oxygen molecules ———-> 18 water molecules + 16 carbon dioxide molecules.

Octane has a relative formula mass of 384

32kg= 32,000g

32,000g / 384 = 83.33 moles of octane

There are 8 times as many moles of carbon... more

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