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Write out a nuclear reaction for the fission of U-235 to Br-87 and La-145. What is...

Write out a nuclear reaction for the fission of U-235 to Br-87 and La-145. What is the mass defect and energy released?

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Answer #1

92U 235 + 0n 1 --------> 35Br 87 + 57La 145 + 2He 4 + 2 -1e 0

The above equation is the nuclear reaction for fission of uranium-235 to Br-87 and La -145.

Uranium contains 92 protons and 143 neutrons.

Actual mass of U-235 = 235.04392994 amu

Total mass of nucleons= ( 92 * 1.0072649) + ( 143* 1.00866492)= 236.40851884 amu

Mass defect= ∆m= 236.90851884 - 235.04392994= 1.8645898994 amu= 3.096222181*10-27 kg

E = energy released= ∆m * C² = 2.79* 10-10 = 1.74 GeV

Where C is the speed of light.

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