A portion of the Sun's energy comes from the reaction
4 11H → 24He + 2 10e
which requires a temperature of to .
(a) Use the mass of the helium-4 nucleus given in Table 21.7 to determine how much energy is released when the reaction is run with 1 mol of hydrogen atoms.
(b)Why is such a high temperature required?
Mass Defects and bbinding Energies for Three Nuclei
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Nucleus
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Mass of Nucleus (amu)
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Mass of Individual Nucleons (amu)
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Mass Defect (amu)
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Binding Energy (J)
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Binding Energy per Nucleon (J)
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24H
2656Fe
92238U
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4.00150
55.92068
238.00031
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4.03188
56.44914
239.93451
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0.03038
0.52846
1.93420
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4.53 X 10-12
7.90 X 10-11
2.89 X 10-10
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1.13 X 10-12
1.41 X 10-12
1.21 X 10-12
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