已知在25℃时:2C(s)+O2(g)=2CO(g) △H1=-222kJ/mol,2H2(g)+O2(g)=2H2O(g) △H2=-484kJ/mol,C(s)+O2(g)=CO2(g) △H3=-394kJ/mol,则25℃时,CO(g)+H2O(g)=CO2(g)+H2(g)的反应热△H4为( )
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