A supernova explosion of a 1.25 × 1031 kg star produces 1.9 × 1044 J of energy. Randomized Variablesm = 1.25 × 1031 kg E = 1.9 × 1044 Part (a)  How many kilograms of mass are converted to energy in the explosion?  Part (b)  What is the ratio Δm / m of mass destroyed to the original mass of the star?

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