1  H        m   =   1.673 533 x 10^(-27) kg

       4  H        m   =   6.694 131 x 10^(-27) kg             (you fill in)

       1  He       m   =   6.646 479 x 10^(-27) kg

   --------------------------------------------------

    delta m            =   0.047 652 x 10^(-27) kg             (you fill in)



      What fraction of the original mass of 4 hydrogen atoms
         is this lost in the process?  Express as a percentage.


               delta m  =  0.007  (4 H)   =  0.7 percent