Question

Calculate the energy released when one atom of uranium-235 is 'completely' converted in to energy.​

Answer 1

Correct option is 9×10  17

10Kg means 10000gram so number of moles will be 10000/235=42.553

So number of atoms 42.553×6.02×10  

23

=256.169×10  

23

atoms

one atom weigh nearly 235amu and 1amu get changed in energy 931.5Mev  

so total energy liberated E=256.169×235×931.5×10  

23

Mev=5.6×10  30

Mev=5.6×10  36  EV

but 1ev=1.6×10  

−19

Joule so energy becomes 5.6×1.6×10  

17

Joule=8.96×10  

17

Joule