A supernova explosion of a 2.00 x 10 31 kg star produces 1.00 x 10 44 J

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A supernova explosion of a 2.00 x 1031 kg star produces 1.00 x 1044 J of energy.

(a) How many kilograms of mass are converted to energy in the explosion? 

(b) What is the ratio Δm/m of mass destroyed to the original mass of the star?

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