I am working on a sci-fi story in which a character has control over matter on the atomic level (think Dr. Manhattan from Watchmen). In thinking up potential tragedies for this character I thought, "Would splitting all the atoms in the human body simultaneously result in any significant explosion?"
I threw 200 pounds into a calculator site and got out
8.1534e+18 joules or
1.9487e+3 megatons of TNT.
Is this use of e=mc^2 valid, assuming the atom splitting could be done through means other than the typical chain reaction that takes place in warheads?