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When 15.75 g of Ba (137.3 g/mol) reacts completely with oxygen, 63.5 kJ of heat are released. Determine H for the reaction as written.2 Ba(s)+ O2(g)2 BaO(s)A. -553.6 kJB. -63.5 kJC. -276.8 kJD. -1107 kJ