Suppose we think of fission of a `._(26)^(56)Fe` nucleus into two equal fragments, `._(13)^(28)Al`. Is the fission energetically possible ? Argue by working out Q of the process. Give `m(._(26)^(56)Fe)=55.93494 u` and `m(._(13)^(28)Al)=27.98191 u`.

Explanation

`Q = [m(._(26)Fe^(56)).-2m(._(13)Al^(28)).]xx931.5 MeV`
`= [55.93494-2xx27.9819]xx931.5 MeV`
`Q=-0.2886xx931.5 MeV=-26.88 MeV`
Which is negative
This fission is not possible energetically.