[填空题]
When a uranium nucleus at rest breaks apart in the proce *1+ue a3li k7fywcv.dsssgjuf,r fw r1gzy cig* 8392e5 known as fission in a nuclear reactor, the resulting g,s5y8fieg 2 * 1rf39wrujgzc fragments have a total kinetic energy of about 200 MeV. How much mass was lost in the process? $\bigtriangleup m$ = $ \times 10^{-28} \, \text{kg}$
