The starting materials in a nuclear change have a total mass of 2.3465 × 10–27 kg. after the change, the resulting materials have a mass of 2.3148 × 10–27 kg. how much energy was released during the change? 2.85 × 10–12 j 2.08 × 10–10 j 2.11 × 10–10 j 8.56 × 10–4 j

Using Einstein's equivalence between mass and energy, we can say that the energy released in the process is given by

where 
is the variation of mass in the process
c is the speed of light

The variation of mass is

Therefore the amount of energy released is

So, the correct answer is A).