Answer
The amount of energy released in each decay is $~~7.77\times 10^{-13}~J$
Work Step by Step
Note that $~~1~u = 1.66\times 10^{-27}~kg$
We can find the difference between the original mass and the final mass that remains after the decay:
$226.0254~u-(222.0176~u+4.0026~u) = 0.0052~u$
This "missing mass" after the decay is the mass that has been converted into energy and released in the decay. We can calculate the energy:
$E = mc^2$
$E = (0.0052)(1.66\times 10^{-27}~kg)(3.0\times 10^8~m/s)^2$
$E = 7.77\times 10^{-13}~J$
The amount of energy released in each decay is $~~7.77\times 10^{-13}~J$
