what is the amount of energy released\required for combustion of 1 litre petrol??????

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Petrol or gasoline is a fuel, so energy will be released on its combustion. 

The energy content of petrol is about 120 MJ/gal. Since 1 gallon contains 3.78 lts, so the given case:

120/3.78 MJ = 31.75 MJ energy will be released on complete combustion of 1 lt of petrol.

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Petrol or gasoline is a fuel, so energy will be released on its combustion. 

The energy content of petrol is about 120 MJ/gal. Since 1 gallon contains 3.78 lts, so the given case:

120/3.78 MJ = 31.75 MJ energy will be released on complete combustion of 1 lt of petrol.

Kindly note that petrol of different octane ratings is available in the market and depending on the octane rating the energy released will be different. Also, for the calculations 100% or complete combustion has been assumed. This may not be true for practical setting (a petrol based automobile engine, etc.) and hence the value may be less. In some countries, ethanol is mixed with petrol (up to a certain fraction) and will also cause different energy release. 

Hope this helps.

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