Answer
Mass defect= 0.13701 amu
Nuclear binding energy= 7.976 MeV/nucleon
Work Step by Step
Mass defect=8(mass $^{1}_{1}H$)+8(mass $^{1}_{0}n$)-mass $^{16}_{8}O$
=8(1.00783 amu)+8(1.00866 amu)- 15.994915 amu
=0.13701 amu.
Nuclear binding energy=$0.13701\,amu\times\frac{931.5\,MeV}{1\,amu}=127.62\,MeV$
Nuclear binding energy per nucleon=
$\frac{127.62\,MeV}{16\,nucleons}=7.976\,MeV/nucleon$
