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Kif is a type K main-sequence star whose core has mass 1029 kg. By the end...

Kif is a type K main-sequence star whose core has mass 1029 kg. By the end of its main-sequence life all the hydrogen in Kif's core will have fused to helium. How much mass will have been changed into energy, when the mass of the core has fused into helium?

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