The energy released in the fission of a 235u nucleus is about 200 mev. how much rest mass (in kg) is converted to energy in this fission?

1kg = 1000grams

mass of uranium = 235

number of atoms in 1 mole = avogadro's number = 6.02 x 10 ²³

Each nucleus will release = 200 Mev of energy.

So, E = 200 x (1000/235) x 6.02 x 10 ²³

= 5.12 x 10²⁶ Mev

Now convert this to joules

1Mev = 1.60218 x 10 ⁻¹³

5.12 x 10²⁶ Mev = 5.12 x 10²⁶ Mev x 1.60218 x 10⁻¹³

= 8.21 x 10¹³ Joules