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a<c<0 b>d>0 2a=b<0 2c=d>0
438.6 kJ/mol 241.8 kJ/mol 285.8 kJ/mol 无法确定
H2燃烧生成1 mol H2O(g)时,放出241.8 kJ的热量 O2前面的表示参加反应的O2的分子数目
241.8 kJ/mol 483.6 kJ/mol 285.8 kJ/mol 571.6 kJ/mol
H2O(g)=H2(g)+1/2 O2(g) ΔH=+242 kJ/mol 2 H2(g)+O2(g)=2 H2O(g) ΔH=-484 kJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=+242 kJ/mol 2 H2(g)+O2(g)=2 H2O(g) ΔH=+484 kJ/mol
p(H2)>p(Ne)>p(O2) p(O2)>p(Ne)>p(H2) p(H2)>p(O2)>p(Ne) p(Ne)>p(H2)>p(O2)
2H2(g)+O2(g)==2H2O(g) △H.1 2H2(g)+O2(g)==2H2O(l) △H.2 S(g)+O2(g)==SO2(g) △H.1 S(s)+O2(g)==SO2(g) △H.2 C.(s)+ O2(g)==CO(g) △H.1C.(s)+ O2(g)==CO2(g) △H.2 H2(g)+ Cl2(g)==2HCl(g) △H.1 H2(g)+ Cl2(g)==HCl(g) △H.2
S(s) + O2 (g) =SO2 (g); △H1 S(g) + O2 (g) =SO2 (g);△H2 2H2(g) + O2 (g)= 2H2O(g);△H1 2H2 (g) + O2 (g) = 2H2O(l);△H2 CO(g) + 1/2 O2(g) = CO2(g);△H1 2CO(g) + O2(g) = 2CO2(g);△H2 H2 (g) +Cl2(g)=2HCl(g);△H1 1/2 H2(g) + 1/2 Cl2(g) = HCl(g);△H2
2H2(g) + O2(g)= 2H2O(g) △H1 ; 2H2(g) + O2(g) = 2H2O(l) △H2 S(g) + O2(g) =SO2(g) △H1 ; S(s) + O2(g) = SO2(g) △H2 CO(g) + 1/2 O2(g) = CO2(g) △H1 ;2CO(g) + O2(g) = 2CO2(g) △H2 C.(s)+H2O(g)=CO(g)+H2(g) △H1 ;CaO(s)+H2O(l)===Ca(OH)2(s) △H2
2H2(g)+O2(g) ==2H2O(l) △H1; 2H2(g)+O2(g) ==2H2O(g) △H2 N2(g)+3H2(g) 2NH3(g) △H1; CaCO3(s) == CaO(s)+CO2 (g) △H2 C.(s)+O2(g) == CO(g) △H1;C.(s)+O2(g) == CO2(g) △H2 H2(g)+Cl2(g) ==2HCl(g) △H1; H2(g)+Cl2(g) == HCl(g) △H2
-82kJ/mol -41kJ/mol -312kJ/mol +82kJ/mol