2NH3(g) ΔH.＜0 2SO3(g)2SO2(g)＋O2(g) ΔH.＞0 4NH3(g)＋5O2(g)4NO(g)＋6H2O(g) ΔH.＜0 H2(g)＋CO(g)C.(s)＋H2O(g) ΔH.＞0 
2NH3(g) ΔH.＜0 
2SO3(g) 2SO2(g)＋O2(g) ΔH.＞0 4NH3(g)＋5O2(g) 4NO(g)＋6H2O(g) ΔH.＜0 H2(g)＋CO(g) C.(s)＋H2O(g) ΔH.＞0
O2(g) 
SO3(g) ΔH.＝－98.3 kJ/mol 2SO2(g)＋O2(g) SO3(l) ΔH.＝－196.6 kJ/mol SO2(g)＋O2(g) SO3(g) ΔH.＝－122.9 kJ/mol 2SO2(g)＋O2(g) SO3(g) ΔH.＝＋196.6 kJ/mol
2NH3(g) △H=―Q1kJ・mol―1(Q1>0) 2SO3(g) 2SO2(g)+O2(g) △H=+Q2kJ・mol―1(Q2>0) 4NH3(g)+5O2(g) 
4NO(g)+6H2O(g) △H=―Q3kJ・mol―1(Q3>0) H2(g) +CO(g) C.(s)+H2O(g) △H=+Q4kJ・mol―1(Q4>0)
2HBr（g）ΔH.＜0 N2（g）+3H2（g）2NH3（g）ΔH.＜0 A.（s） B.（s）+C.（g）ΔH.＞0 4NH3（g）+5O2（g）4NO（g）+6H2O（g）ΔH.＜0
2NH3(g) ΔH＜0 2SO3(g) 2SO2(g)＋O2(g) ΔH.＞0 4NH3(g)＋5O2(g) 4NO(g)＋6H2O(g) ΔH.＜0 H2(g)＋CO(g) C.(s)＋H2O(g) ΔH.＞0
2NH3(g) △H<0 2CO(g)=2C(s)+ O2(g) △H>0
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