Antimatter bomb

When a massive particle collides with its corresponding antiparticle, they annihilate, producing photons with energy equal to their rest mass energy.

Imagine that you had 1 g1\text{ g} of hydrogen and 1 g1\text{ g} of anti-hydrogen. How much energy would you release if you let them collide? Express your answer as an order of magnitude. (That is, give k,k, when your answer is of the form a×10ka \times 10^k joules.)

For comparison, the atomic bomb detonated over Nagasaki released 8.8×1013 J8.8 \times 10^{13}\text{ J}.

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