How much mass change per mole of uranium-235 using the exact
mass of isotopes and neutons the mass of a neutron is 1.00866
amu.
(141.9164 amu), 91Kr (90.9234 amu), and n (1.00866 amu).
find the energy released in joules/mokes
1n + 235U → 142Ba + 91Kr + 3 1n
1n + 235U → 142Ba + 91Kr + 3 1n
Mass of reactants
1n = 1.00866
235U = 235.043924
Total mass of reactants: 1.00866 + 235.043924 = 236.0526 amu
Mass of Products
142Ba = 141.9164
91Kr = 90.9234
Total mass of products: 141.9164 + 90.9234 + (3 x 1.00866) = 235.8658 amu
Mass Change: 236.0526 - 235.8658 = 0.1868 amu
1 amu = 1.66 x 10-24 g
Mass change per mole: 0.1868 amu x 1.66 x 10-24 g/amu x 6.023 x 1023 / mole x 1000 g/ 238g/mole = 0.794 g
Amount of energy released: 0.794 g x (1amu/1.66x10-24g) = 1.31 x 1024 amu x 931 x 106 eV / amu x 1.6 x 10-19 J
Amunt of energy released: 1.95 x 1014 J
Amount of energy released per mole of U235 is 1.95 x 1014J
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