A nuclear device containing 800kg of plutonium explodes the

Question

A nuclear device containing 8.00kg} of plutonium explodes. The rest mass of the products of the explosion is less than the original rest mass by one part in 10^4.

Part A How much energy is released in the explosion?

E = {Joules}

Part B If the explosion takes place in 4.00\mu {\rm s} , what is the average power developed by the bomb?

P = {Watts}

Part C What mass of water could the released energy lift to a height of 1.00{\rm km} ?

m = {kg}