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-726.5 KJ/mol -1087.5KJ/mol -1268 KJ/mol +1994.5 KJ/mol
(+4a+2b-2m-4n) (+4a+2b-2m-4n)KJ/mol -(+4a+2b-2m-4n)KJ/mol (+4a+2b-m-2n)KJ/mol
2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(g) △H.=–1076.7 kJ/mol N2H4(g) + 1/2N2O4(g) =3/2N2(g) + 2H2O(g) △H.=–542.7 kJ/mol 2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(g) △H.=–542.7 kJ/mol 2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(l) △H.=–1059.3 kJ/mol
2CH4(g) + 4O2(g) = 2CO2(g) + 4H2O(l);ΔH= +890KJ・mol―1 CH4(g) + 2O2(g) = CO2(g) +2H2O(l); ΔH=+890KJ・mol―1 CH4(g) + 2O2(g) = CO2(g) +2H2O(l); ΔH= -890KJ・mol―1 2CH4(g) + 4O2(g) = 2CO2(g) + 4H2O(l);ΔH= -890KJ・mol―1
2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣542.7 kJ/mol 2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣1059.3 kJ/mol N2H4(g)+N2O4(g)═N2(g)+2H2O(g);△H=﹣1076.7 kJ/mol 2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣1076.7 kJ/mol
-44.2kJ・mol-1 +44.2kJ・mol-1 -330kJ・mol-1 +330kJ・mol-1
-44.2kJ・mol-1 +44.2kJ・mol-1 -330kJ・mol-1 +330kJ・mol-1
+262.6kJ・mol-1 -131.3kJ・mol-1
-352.3kJ・mol-1 +131.3kJ・mol-1
反应①②均为放热反应 反应①②转移的电子数相同 由反应①可推知:CH4(g)+4NO2(g)=4NO(g)+CO2(g)+2H2O(l);△H=-a kJ・mol―1,a<574 若用标准状况下4.48L CH4还原NO2至N2,放出的热量的173.4kJ。
818.5 kJ・mol-1 ―818.5 kJ・mol-1 80.0 kJ・mol-1 ―80.0 kJ・mol-1
H2O(g) = H2(g)+1/2 O2(g);△H1=+242 kJ・mol-1 2 H2(g)+ O2(g)=2 H2O(l);△H2=- 484 kJ・mol-1 H2(g)+1/2 O2(g)=H2O(g) ;△H1=+242 kJ・mol-1 2 H2(g)+ O2(g)=2 H2O(g);△H2=+484 kJ・mol-1
由反应①可推知:CH4(g)+4NO2(g)=4NO(g)+CO2(g)+2H2O(1);△H>-574kJ・mol―1 等物质量的甲烷参与反应①②,甲烷完全反应,转移的电子数相同 若用标准状况下4.48LCH4还原NO2至N2,放出的热量为173.4kJ 以上两个反应都是焓减熵增的反应,所以两个反应都易发生,速率快
488.3kJ・mol-1 -244.15kJ・mol-1 -488.3kJ・mol-1 244.15 kJ・mol-1
氢气的燃烧热大于242kJ・mol-1 ①的反应热为484kJ・mol-1 稀硫酸与稀NaOH溶液反应的中和热为-57.31kJ・mol-1 稀醋酸与稀NaOH溶液反应生成1mol水,放出57.3kJ热量
-283.01kJ・mol-1 +172.51kJ・mol-1
+283.01kJ・mol-1 +504.00kJ・mol-1
488.3 kJ・mol-1 -244.15 kJ・mol-1 244.15kJ・mol-1 -488.3kJ・mol-1
2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g) ΔH=-542.7 kJ·mol-1 2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g) ΔH=-1 059.3 kJ·mol-1 N2H4(g)+1/2 N2O4(g) ====3/2N2(g)+2H2O(g) ΔH=-1 076.7 kJ·mol-1 2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g) ΔH=-1 076.7kJ·mol-1