# Energy from Uranium fission

How do I find the energy released by uranium fission into Nb and Pr ? Every time I see the equation for some nuclear fission it always just states the energy released but what if we didn't know it as a broader question the elements used before are just an example of a fission equation I saw.

• Well, you could compare the binding energies of the parent and daughter nuclei. Commented Feb 4, 2016 at 0:42
• so sum the Nb and Pr for example and find the difference ? Commented Feb 4, 2016 at 0:46
• Nb and Pr cannot be the fission products as the sum of their atomic numbers is 100, not 92. Protons aren't destroyed in fission reactions. In any case, for such a calculation you need to fully specify the fission isotopes (as well as the starting U isotope).
– Gert
Commented Feb 4, 2016 at 1:03
• Nb and Pr may result from different uranium fissions chains
– user46925
Commented Feb 4, 2016 at 1:38
• @igael - the poster obviously believes otherwise. Commented Feb 4, 2016 at 2:51

The sum of the actual atomic masses of the reaction products minus the sum of the actual atomic masses of the reacting species gives you the amount of mass converted to energy during the fission. That latter amount can be found by applying $E=mc^2$ to that mass deficit.