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438.6 kJ/mol 241.8 kJ/mol 285.8 kJ/mol 无法确定
它们都是吸热反应 a、b和c均为正值 a=b 2b=c
241.8 kJ/mol 483.6 kJ/mol 285.8 kJ/mol 571.6 kJ/mol
H2(g)+Cl2(g)=2HCl(g);△H=-a 1/2H2(g)+1/2Cl2(g)=HCl(g);△H=-b C(s)+1/2O2(g)=CO (g);△H=-a (s)+O2(g)=CO2 (g);△H=-b C. 2H2(g)+O2(g)=2H2O(l);△H=-a 2H2(g)+O2(g)=2H2O(g);△H=-b S(g)+O2(g)=SO2 (g);△H=-a S(s)+O2(g)=SO2 (g);△H=-b
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
密闭容器中,9.6 g硫粉与11.2 g铁粉混合加热生成17.6 g硫化亚铁时,放出19.12 kJ热量。则Fe(s)+S(s)===FeS(s) ΔH=-95.6 kJ·mol-1 稀醋酸与0.1 mol·L-1 NaOH溶液反应:H.+(aq)+OH-(aq)=H2O(l)ΔH=-57.3 kJ·mol-1 已知1 mol氢气完全燃烧生成液态水所放出的热量为285.5 kJ,则水分解的热化学方程式为2H2O(l)===2H2(g)+O2(g) ΔH=+285.5 kJ·mol-1 已知2C(s)+O2(g)=2CO(g)ΔH=-221 kJ·mol-1,则C.的燃烧热ΔH=-110.5 kJ·mol-1
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
H2O(g)=H2(g)+ 1/2O2 (g)△H=+242 kJ.mol-1 2H2(g)+O2(g)=2H2O(l) △H= -484 kJ.mol-l H2(g)+ 1/2O2(g)=H2O(g) △H=+242 kJ.mol-l 2H2(g) + O2(g) = 2 H2O(g) △H= -484 kJ