How Is Energy Stored In Petroleum And How Is It Released?

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The primary constituent of petroleum is octane.  Octane molecules store energy in long chains of chemical bonds.  When combined with a proper mix of oxygen and a spark, combustion will release the energy and produce water vapor and C02.  Some additional products of incomplete combustion are also created which become pollutants in our environment.  
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Energy is stored in petroleum because of the movement of space and from the light in the sun

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