According to mass and energy equation (26-7), a kilogram of coal has a rest ener

Question

According to mass and energy equation (26-7), a kilogram of coal has a rest energy so large that if the entire rest energy of the coal were converted into electric energy, it wold be enough to supply the electricity needs of a typical American household for millions of years. But we don't get that large amount of energy by burning a kilogram of coal because

burning the coal is never complete. burning the coal is not realistic. burning coal does not convert all mass into energy. all of the above.

Explanation / Answer

Answer is '' allof the above''

because when coal is burned it gets converted in to ash so it' all energy stored inside the coal is not taken out completely .ash still has some fraction of mass of coal

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