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The amount of energy released in burning...

The amount of energy released in burning 1 kg of coal is

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(a) Energy required to break one bond of DNA `=(10^(-20)J)/(1.6xx10^(-19)Je//V)=0.06eV`
(b) Typical energy of a proton in a nucleus `=(10^(-13)J)/(1.6xx10^(-19)J//eV)=625000eV`
(c ) Energy released in buming 1000 kg of coal `=(3xx10^(10)J)/(4.2xx10^(3)"J/kcal")=7142857.14" kcal"`
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