I have no idea what you mean by "burned completely".
If you mean somehow the entire mass is converted to energy then:
E = m c^2 = 0.5 * 3*10^8 * 3*10^8 = 4.5 *10^16 Joules
which is quite a lot.
What will be the amount of energy released when 0.5kg of uranium is burned completely
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