已知在25 ℃时:2C(s)+O2(g)=2CO(g) △H1=-222 kJ/mol2H2(g)+O2(g)=2H2O(g) △H2=-484 kJ/molC(s)+O2(g)=CO2(g) △H3=-394 kJ/mol则25 ℃时,CO(g)+H2O(g)=CO2(g)+H2(g)的反应热 △H4为
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