The energy released during the fission of 1 kg of uranium is
 

${ }_{92}^{235}\mathrm{U}{+}_0^1\mathrm{n}{⟶}_{56}^{141}\mathrm{Ba}{+}_{36}^{92}\mathrm{Kr}+3_0^1\mathrm{n}$

Find the number of moles, then

$4.2553\times 6.023\times {10}^{23}\times 344\times {10}^{-13}=8.81\times {10}^{13}\mathrm{J}=8.81\times {10}^{20}\mathrm{erg}$