[trinhn812]

A small atomic bomb releases energy equivalent to the dtonation of 20,000 tons of TNT; a ton of TNT releases 4e9J of energy when exploded. Using 2e13 J/mol as the energy released by fission of 235-Uranium, approzimately what mass of 235-uranium undergoes fission in this atomic bomb?

So Uranium has atomic number of 92 and 907.18474 kg = 1ton


20000 tons TNT x (4e9 J energy/ton TNT) = 80000e9 J
Im not sure what to do wjth 2e13 J/mol of uranium

[Yggdrasil]

If 1 mol of uranium undergoes fission, it produces 2e13 J of energy.  How many moles of uranium need to fission in order to produce 8e13 J or energy?