Question

The neutron-induced fission of U-235 produces Ba-140 and Kr-93, along with 3 neutrons. Use the following atomic masses: U-325: 235.04392 amu neutron: 1.00866 amu Ba-140: 139.910581 amu Kr-93: 92.931130 amu If the US needs 1.42 x 1016 kJ of electrical energy every year (for 2018 the value was 1.44 x 1016 kJ), how many kg of U-235 would have to undergo fission to supply this energy? (You can assume 100% efficiency in the conversion of energy from the fission reaction to electricity. This is of course not the case.) Note: For fun, compare this mass of uranium to the mass of coal that would be required-for every kg of uranium, you need 4,500 TONS of coal!! Report your answer without scientific notation (hint: you shouldn't need a ridiculous number of digits to express your answer) and with three significant figures (meaning you will have to round it!)

Answer 1

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