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Calculate and compare the energy released by a) fusion of 1.0 kg of hydrogen deep within Sun and b) the fission of 1.0 kg of 235U in a fission reactor.

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(a) Amount of hydrogen, m = 1 kg = 1000 g 1 mole, i.e., 1 g of hydrogen () contains 6.023 × 1023 atoms. ∴1000 g of contains 6.023 × 1023 × 1000 atoms. Within the sun, four nuclei combine and form one nucleus. In this process 26 MeV of energy is released. Hence, the energy...
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(a) Amount of hydrogen, m = 1 kg = 1000 g

1 mole, i.e., 1 g of hydrogen () contains 6.023 × 1023 atoms.

∴1000 g of contains 6.023 × 1023 × 1000 atoms.

Within the sun, four nuclei combine and form one nucleus. In this process 26 MeV of energy is released.

Hence, the energy released from the fusion of 1 kg is:

(b) Amount of = 1 kg = 1000 g

1 mole, i.e., 235 g of contains 6.023 × 1023 atoms.

∴1000 g ofcontains

It is known that the amount of energy released in the fission of one atom of is 200 MeV.

Hence, energy released from the fission of 1 kg of is:

Therefore, the energy released in the fusion of 1 kg of hydrogen is nearly 8 times the energy released in the fission of 1 kg of uranium.

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