# Homework Help: Energy Released in Fission Reaction

1. Dec 1, 2007

### Ryo124

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

A typical fission reaction is
U(92,235) → Zr(40,98) + Te(52,135) + 2 n

The numbers in parentheses are (Z,A) for each isotope; n stands for a neutron.

The atomic masses of the isotopes are: U(92,235) = 235.043923 u; Zr(40,98) = 97.912746 u; Te(52,135) = 134.916450 u; n = 1.008665 u.

How much mass energy is released in the fission reaction? Use this number as typical of fission reactions. (Express the answer in MeV.)

2. Relevant equations

E = mc^2

(The atomic mass unit is 1 u = 931.5 MeV/c^2 = 1.67 ×10−27 kg where c is the speed of light.)

3. The attempt at a solution

I've calculated the loss of the the reaction to be 3.37E-28 kg, then tried plugging it into E = mc^2, but it did not work.

2. Dec 1, 2007

### fotisz

3.37E-28 kg
How did you calculate that?

3. Dec 1, 2007

### Ryo124

Never mind, I did it wrong, I got the correct answer of 183.9 MeV.