12N2gO2gNO的精选

问题详情：已知反应：H2(g)+1/2O2(g)=H2O(g)        ΔH1 1/2N2(g)+O2(g)=NO2(g)         ΔH21/2N2(g)+3/2H2(g)=NH3(g)      ΔH3则反应2NH3(g)+7/2O2(g)=2NO2(g)+3H2O(g)的ΔH为（ ）A.2ΔH1+2Δ...