Find the energy eqivalent of one atomic mass unit, first in Joules and then in MeV. Using this express the mass defect of `""_8^16O` in `MeV//e^2`.

Explanation

`1u = 1.6605 xx 10^(-27) kg`
To convert it into energy units, we multiply it be `c^2` and find that energy equivalent
`=1.6605 xx 10^(-27) xx (2.9979 xx 10^8) kg m^2//s^2 = 1.4924 xx 10^(-10)J`
`= (1.4924 xx 10^(-10))/(1.602 xx 10^(-19)) eV = 0.9315 xx 10^9 eV = 931.5 MeV`
Or, `1u = 931.5 MeV//c^2`
For `""_8^16O, DeltaM = 0.1369 u = 0.13691 xx 931.5 MeV//c^2 = 127.5 MeV//c^2`
The energy needed to separate `""_8^16O` into its constituents is thus `127.5 MeV//c^2`.