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E = 1.630MeV*1.60x10^-13/1MeV = 2.608x10^-13J
Using E = mc^2 we have m = E/c^2 = 2.608x10^-13/(3.00x10^8)^2 = 2.89777x10^-30kg
This is 2.897777x10^-30/1.67x10^-27 = 0.0017352 u
So m of the excited neon = 19.992435 + 0.0017352 = 19.994185 u
1) 19.994185 u
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