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已知：①CO2(g)+2H2(g)═ CH3OH(g)+O2(g) △H=+192.9kJ/mol ②H2(g)+ O2(g)═H2O(l) △H=−285.8kJ/mol 则CH3OH(g) +O2...
题目内容：
已知：①CO2(g)+2H2(g)═ CH3OH(g)+
O2(g) △H=+192.9kJ/mol
②H2(g)+ O2(g)═H2O(l) △H=−285.8kJ/mol
则CH3OH(g) +
O2(g)═CO2(g)+2H2O(l)的△H为( )
A. +478.7kJ/mol
B. −764.5 kJ/mol
C. −478.7kJ/mol
D. +764.5kJ/mol
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