Fission of a uranium-235 nucleus can occur as a chain reaction as multiple neutrons are released through each reaction. The average energy released from a single uranium-235 nucleus is 3.2 ✕ 10−11 J. (The mass of one mole of uranium-235 = 235.043923 g/mol; 3.6 ✕ 109 joule = 1 MWh) (a) Determine the energy released from the fission reaction of 1.0 kg of uranium-235, which is the critical mass of uranium-235. J (b) If a nuclear power plant is 27% efficient, what mass of uranium-235 must undergo fission to produce 12 MWh (megawatt hour) of power? (12 MWh is the typical amount of energy used per household per year.) g