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Question

Calculate Q value of the following nuclear reaction.
13Al27+2He414Si30+1H1+Q

The exact mass of 13Al27 is 26.9815 amu, 14Si30 is 29.9738 amu, 2He4 is 4.0026 amu and 1H1 is 1.0078 amu.

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Solution

Mass of reactants = mass of 13Al27+ mass of 2He4
Mass of reactants =26.9815+4.0026=30.9841 amu
Mass of products = mass of 14Si30+ mass of 1H1
Mass of products =29.9738+1.0078=30.9816 amu
The mass defect Δm=30.984130.9816=0.0025 amu
Q value =0.0025amu×931.5MeV/amu=2.33MeV

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