Answer :
The energy produced from fission 1.00 kg of 235U is 8.99 kJ. Fission is the process in which a large nucleus divides into two or more fragments. Uranium-235 is the most widely used fissile material, which can undergo a fission reaction.
During the fission of 235U, a Q-value of 208 MeV/fission is generated. In a fission of 235U, the Q value is 208 MeV/fission. The molar mass of 235U is 235 g/mol. 1 mol of 235U contains 6.02 x 10²³ atoms/mol. A single nucleus of 235U produces Q = 208 MeV when fission occurs. The amount of energy generated per mole of 235U fission is calculated below:1 mole of 235U = 235 g = 235/1000 kg = 0.235 kg1 mole of 235U contains 6.02 x 10²³ nuclei Q value per 235U nucleus = 208/6.02 x 10²³ MeV/nucleus Q value per 1 mole of 235U = (208/6.02 x 10²³) x 6.02 x 10²³ = 208 MeV/mol.
Therefore, the energy released per 1 mole of 235U fission is 208 MeV/mol. If 1.00 kg of 235U is fissioned, then the number of moles of 235U will be; Mass of 235U = 1.00 kg = 1000 g, Number of moles of 235U = Mass of 235U / Molar mass of 235UNumber of moles of 235U = 1000 g / 235 g/mol = 4.26 mol. The energy produced from fissioning 1.00 kg of 235U can be calculated as follows: Energy produced = 208 MeV/mol x 6.02 x 10²³ nuclei/mol x 4.26 mol = 5.63 x 10²¹ eV= 8.99 x 10³ J= 8.99 kJ
Answer: The energy produced from fission 1.00 kg of 235U is 8.99 kJ.
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