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-726.5 KJ/mol -1087.5KJ/mol -1268 KJ/mol +1994.5 KJ/mol
2NO2N2O4 △H= -57kJ/mol(反应热) 1/2Ba(OH)2(aq)+HCl(aq)==1/2BaCl2(aq)+H2O(l)△H= -57.3kJ/mol(中和热) S.(s)+O2(g)==SO2(g) △H= + 269.8kJ/mol(反应热) C8H18(l)+1/2 O2(g) ==8CO2(g)+9H2O(g) ΔH= - 5518kJ·mol-1(燃烧热)
(+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
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
2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g); △H.=-542.7kJ/mol 2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g); △H.=-1059.3kJ/mol 2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g); △H.=-1076.7kJ/mol N2H4(g)+1/2 N2O4(g)= 3/2N2(g)+2H2O(g);△H.=-1076.7kJ/mol
CH4 (g)+2NO2 (g)= N2 (g)+CO2 (g)+2H2O (l) △H.=-867 kJ·mol-1 若0.2 mol CH4还原NO2至N2,在上述条件下放出的热量为173.4 kJ 1molCH4催化还原NOx为N2的过程中,若x=1.6,则转移的电子为3.2 mol 若用4.48L CH4还原NO2至N2,整个过程中转移的电子为3.2 mol
2NO2N2O4 △H= -57kJ/mol(反应热) 1/2Ba(OH)2(aq)+HCl(aq)==1/2BaCl2(aq)+H2O(l)△H= -57.3kJ/mol(中和热) S.(s)+O2(g)==SO2(g) △H= + 269.8kJ/mol(反应热) C8H18(l)+1/2 O2(g) ==8CO2(g)+9H2O(g) ΔH= - 5518kJ·mol-1(燃烧热)
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