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The energy released when 1 g of 235U92 finally undergoes fission is

1. 12.75 × 10⁷ kJ
2. 16.40 × 10⁷ kJ
3. 8.20 × 10⁷ kJ
4. 6.50 × 10⁶ kJ

Correct answer: 8.20 × 10⁷ kJ

Solution

The energy released per fission of 1 atom of 235U is approximately 200 MeV. Using Avogadro's number and the molar mass of uranium, the energy released for 1 g of 235U can be calculated, which matches option C.

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