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单项选择题已知:C(s)+O2(g)CO2(g)△H=-393.5kJ·mol-1 Mg(s)+O2(g)MgO(s)△H=-601.8kJ·mol-1 Mg(s)+C(s)+O2(g)MgCO3(s)△H=-1113kJ·mol-1 则MgO(s)+CO2(g)MgCO3(s)的△H为()kJ·mol-1

A、-235.4

B、-58.85

C、-117.7

D、-1321.3

  • C
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