Convert 2000 kW·h to J:
"E=2000\u00b71000\u00b73600=7.2\u00b710^9\\text{ J}."Find how many fissions (uranium atoms) can provide this amount of energy:
"n=E\/E_U=\\frac{7.2\u00b710^9}{208\u00b71.6\u00b710^{-13}}=2.16\u00b710^{20}\\text{ fissions}."One uranium-235 weighs 235·1.66·10-27 kg. So, the number of fissions we found above corresponds to the following mass of uranium:
"M=nm=2.16\u00b710^{20}\u00b7235\u00b71.66\u00b710^{-27}=8.43\u00b710^{-5}\\text{ kg}."
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