# Extracted energy of Uranium

1. Dec 15, 2008

### element1945

1. The problem statement, all variables and given/known data

What proportion of the total energy in Uranium-235 is extracted through nuclear fission?

In 2001, the world electricity consumption was 13.81 trillion kWh. Assuming 50% efficiency in converting and distributing the power, and imagining that all production was nuclear, how many kg of radioactive waste (Xe and Sr) would have been created?

2. Relevant equations

1 n + 235U -> 140Xe + 94Sr + 2 n + gamma

1 MeV = 1.602x10^-13 J
1 kWh = 3.6x10^6 J

3. The attempt at a solution

Using the reaction and the binding energies the released energy is equal to 175 MeV.

how do i calculate the proportion of the extracted and total energy?

how do i use the % of efficiency and the global production to calculate the waste?

2. Dec 15, 2008

### element1945

i forgot that the total energy of Uranium is the binding energy i think that is 1786 MeV.

3. Dec 15, 2008

### element1945

i dont know how to relate the total and the released energy, and how to relate the 50% efficiency with the released energy and the global consumption.... please help :(?