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12. Given that DHfo of MnO2 is -520 kJ/mol, what is the DHrxno of 3 MnO2(s) ® 3 Mn(s) + 3 O2(g) (in kJ)? (A) 520 (B) -520 (C) 1560 (D) -1560 (E) 173 (F) -173 (G) not enough info.