單項(xiàng)選擇題

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
則MgO(s)+CO2(g)MgCO3(s)的△H為()kJ·mol-1

A.-235.4
B.-58.85
C.-117.7
D.-1321.3


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