Question

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

Part A 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 2.69 g of hydrogen-1? Express your answer to three significant figures and include the appropriate units.

Answer 1