Unlike chemical reactions, for which mass is conserved, nuclear reactions result in slight changes in mass. When mass is lost, it becomes energy according to the equation
ΔE=Δm⋅c2
where ΔE is the energy in joules, Δm is the mass defect in kilograms, and c is the speed of light (c=3.00×108 m/s). The mass defect is the difference between the total mass of the products and the total mass of reactants. The following values can be used to calculate the mass defect.
| Particle | Mass (g/mol) |
| 01e | 0.00054858 |
| 11H | 1.00782 |
| 42He | 4.00260 |
The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is
411H→42He+201e
How much energy in joules is released by the fusion of 2.24 g of hydrogen-1?
Express your answer to three significant figures and include the appropriate units.
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Unlike chemical reactions, for which mass is conserved, nuclear reactions result in slight changes in mass....