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a＜c＜0 b＞d＞0 2a＝b＜0 2c＝d＞0
3Fe+2O2====Fe3O4 2H2O====2H2↑+O2↑ 2Mg+O2===2MgO H2SO4+NaOH===NaSO4+H2O
－82kJ/mol －41kJ/mol －312kJ/mol ＋82kJ/mol
241.8 kJ/mol 483.6 kJ/mol 285.8 kJ/mol 571.6 kJ/mol
2.43 kJ 4.86 kJ 43.8 kJ 87.5 kJ
2ΔH1=ΔH2 ΔH1<0，ΔH2>0 ΔH5=ΔH3+2ΔH1-ΔH2 2ΔH1 -ΔH2>0
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
放出的热量为（0.4Q1+0.05Q3）KJ/mol 放出的热量为（0.4Q1+0.05Q2）KJ/mol △H2 > △H3 △H2 <△H3
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
2H2O 2H2↑+O2↑ Cl2+H2O HCl+HClO 2F2+2H2O 4HF+O2 2Na+2H2O 2NaOH+H2↑
S(s)＋O2(g)
→ SO2(g) ΔH1 S(g)＋O2(g) → SO2(g) ΔH 2 2H2(g)＋O2(g) → 2H2O(l) ΔH 1 2H2(g)＋O2(g) → 2H2O(g) ΔH 2 NaOH(aq)＋HCl(aq) → NaCl(aq)＋H2O(l) ΔH 1
NaOH(aq)＋CH3COOH(aq) →CH3COONa(aq)＋H2O(l) ΔH 2
H2(g)＋F.2(g) → 2HF(g) ΔH 1 H2(g)＋Cl2(g) → 2HCl(g) ΔH 2
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
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