已知:①CO2(g)+3H2(g)CH3OH(g)+H2O(g) △H1=-49.0kJ•mol-1
②CO2(g)+H2(g)CO(g)+H2O(g) △H2=+41.0kJ•mol-1
则CO(g)+2H2(g)CH3OH(g)的△H为( )
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