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a<c<0 b>d>0 2a=b<0 2c=d>0
ΔH1>0,ΔH3<0 ΔH2>0,ΔH4>0 ΔH1=ΔH2+ΔH3 ΔH3=ΔH4+ΔH5
已知:H2(g)+O2(g)═H2O(l);△H=﹣285.8 kJ•mol﹣1 , 则H2的燃烧热为﹣285.8 kJ•mol﹣1
已知:S.(g)+O2(g)═SO2(g)△H1=﹣Q1;S.(s)+O2(g)═SO2(g)△H2=﹣Q2 , 则Q1<Q2
已知:H2SO4(浓)+NaOH(aq)═Na2SO4(aq)+H2O(l)△H1;CH3COOH(aq)+NH3•H2O(aq)═CH3COONH4(aq)+H2O(l)△H2 , 则有|△H1|<|△H2|
已知:Fe2O3(s)+3C(石墨)═2Fe(s)+3CO(g)△H=+489.0 kJ•mol﹣1
CO(g)+O2(g)═CO2(g)△H=﹣283.0 kJ•mol﹣1
C.(石墨)+O2(g)═CO2(g)△H=﹣393.5 kJ•mol﹣1
则4Fe(s)+3O2(g)═2Fe2O3(s)△H=﹣1641.0 kJ•mol﹣1
ΔH.3=ΔH.1+2ΔH3 ΔH.3=ΔH.1+ΔH.2 ΔH.3=ΔH.1-2ΔH.2 ΔH.3=ΔH.1-ΔH.2
△H3=△H1+2△H2 △H3=△H1+△H2 △H3=△H1-2△H2 △H3=△H1-△H2
△H3=△H1+2△H2 △H3=△H1+△H2 △H3=△H1﹣2△H2 △H3=△H1﹣△H2
△H3=△H1+2△H2 △H3=△H1+△H2 △H3=△H1﹣2△H2 △H3=△H1﹣△H2
ΔH3=ΔH1+ΔH2 ΔH3=ΔH1+2ΔH2
ΔH3=ΔH1-2ΔH2 ΔH3=ΔH1-ΔH2
4a+4b+4c 2a-2b+6c 2a-2b+2c 2a-6b+2c
△H3 =2△H1+2△H2 △H3 =2△H1—△H2 △H3 =2△H1—2△H2 △H3 =2△H1+△H2
ΔH3=ΔH1+2ΔH2 Δ H3=ΔH1+ΔH2 ΔH3=ΔH1-2ΔH2 Δ H3=ΔH1-ΔH2
2ΔH1 + 2ΔH2 - 2ΔH3 ΔH1 + ΔH2 - ΔH3 3ΔH1 + 2ΔH2 + 2ΔH3 3ΔH1 + 2ΔH2 - 2ΔH3