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Calculate delta H rxn for the reaction MnO2(s) + 2C(graphite) ---> Mn(s) +2CO(g) from the following information: Mn(s) +O2(g) ---> MnO2 delta H = -520.03 kJ 2C(graphic) + O2(g) ---> 3CO (g) delta H = -221.04 kJ
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