Hydrogen Bomb....

[Xyooj]

how much energy is in a H-bomb or how much destruction can it cause if it's the size of a missile?

[mgb_phys]

The largest built was a Russian design of around 150MT, that is equivalent to 150,000,000 tons of TNT or 10,000 the bombs used on Hiroshima and Nagasaki!
One part of it was tested giving a yield of 50MT. The full weapon was pretty useless since if dropped on an enemy in europe it would cause damage in Russia!