Energy released at annihilation of 1 kilogram of matter

Using the famous mass-energy relation (E = mc²) of Albert Einstein, one can arrive at the conclusion that 1 kilogram matter is equivalent to 9 × 10¹⁶ J of energy. The energy content of fuels is as follows:

1 barrel (159 litres) of crude oil º 6.1 × 10⁹ J

1 ton of coal º 3.2 × 10¹⁰ J

1 ton of Uranium 235 º 7.4 × 10¹⁶ J