Coal can contain up to about 2000 ppm (by mass) of natural uranium.
Compare the chemical energy content of the coal with the available fission energy from the ${ } ^ { 235 } \mathrm { U }$ content of the uranium (as used in a thermal reactor) and the total available fission energy from the uranium including ${ } ^ { 238 } \mathrm { U }$ (as might be used in a breeder reactor).

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The Answer of Coal can contain up to about 2000 ppm (by mass) of natural uranium.
Compare the chemical energy content of the coal with the available fission energy from the ${ } ^ { 235 } \mathrm { U }$ content of the uranium (as used in a thermal reactor) and the total available fission energy from the uranium including ${ } ^ { 238 } \mathrm { U }$ (as might be used in a breeder reactor).

Coal Can Contain Up to About 2000 Ppm (By Mass) 235U{ } ^ { 235 } \mathrm { U }235U

Coal Can Contain Up to About 2000 Ppm (By Mass) ${ } ^ { 235 } \mathrm { U }$