Say, if I annihilated 1kg of matter with 1kg of antimatter, did I release 1 or 2kg worth of mass energy?
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You would release 2kg worth of energy. The equation makes no assumption regarding the type of matter being converted. So for every particle of matter you need a particle of antimatter with the release of two times the mass on one particle in energy.
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That's right. Antimatter particles' quantum values are opposite those of their 'normal' matter counterparts -- intrinsic spin, electric charge, lepton number, etc. But their masses are exactly the same.
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