1. The problem statement, all variables and given/known data For the common isotope of nitrogen, 14N, calculate the mass defect. 2. Relevant equations [tex]\Delta[/tex]M = Zmp + Nmn - M 3. The attempt at a solution 7(1.00727646688)+7(1.00866491560)-14.003074 [tex]\Delta[/tex]M = .108516177 Masteringphysics says this is wrong. says i may have made a rounding error? i have input three variations of this answer but all have been wrong. where am i making the mistake.