2CH3OHgO2g的精选

问题详情：已知：①2CO2(g)+4H2(g)═2CH3OH(g)+O2(g)△H=+385.8kJ/mol②2H2(g)+O2(g)═2H2O(l)△H=−571.6kJ/mol，则CH3OH(g)+O2(g)═CO2(g)+2H2O(l)的△H为(    )A．+478.7kJ/mol    B．−764.5 kJ/mol  C．−478.7k...