Q:  How much energy is released by a single conversion of 4 H into 1 He?
            Express in Joules, and in MeV.



                E   =  (delta m) * c^2  

                    =  0.047 652 x 10^(-27) kg  *  (3 x 10^8 m/s)^2

                    =  4.28 x 10^(-12) J

                    =  27 MeV