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a+b+c 0.5(a+b+c)
0.5a-1.5b+0.5c 1.5a-0.5b+0.5c
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
404 KJ/mol 260 KJ/mol 230 KJ/mol 200 KJ/mol
H2(g)的燃烧热为571.6 kJ·mol-1 同质量的H2(g)和CH3OH(l)完全燃烧,H2(g)放出的热量多 1/2H2SO4(aq)+1/2Ba(OH)2(aq)===1/2BaSO4(s)+H2O(l) ΔH.=-57.3 kJ·mol-1 3H2(g)+CO2(g)=CH3OH(l)+H2O(l) ΔH.=+135.9 kJ·mol-1
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
a<c<0 b>d>0 2a=b<0 2c=d>0
2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l)ΔH=-4bkJ・mol-1
C2H2(g)+5/2O2(g)=2CO2(g)+H2O(l)ΔH=2bkJ・mol-1
2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l)ΔH=-2bkJ・mol-1
2C2H2(g)+5O2(g)=4CO2(g)+2H2O(l)ΔH=bkJ・mol-1
同质量的H2(g)和CH3OH(l)完全燃烧,H2(g)放出的热量多 H2(g)的燃烧热为571.6 kJ•mol-1 1/2H2SO4(aq)+1/2Ba(OH)2(aq)=1/2BaSO4(s)+H2O(l) ΔH.=-57.3 kJ•mol-1 3H2(g)+CO2(g)=CH3OH(l)+H2O(l) ΔH.=+135.9 kJ•mol-1
已知2H2O(l)═2H2(g)+O2(g)△H=+571.6KJ•mol-1,无法求H2的燃烧热
已知C(石墨,s)=C(金刚石,s)△H>0,无法比较二者的稳定性
已知500℃、30MPa下,将0.5molN2和1.5molH2置于密闭的容器中充分反应生成NH3(g),放出19.3KJ的热量,无法推出该反应的热化学方程式
已知2C(s)+2O2(g)═2CO2(g)△H1;2C(s)+O2(g)═2CO(g)△H2,无法得出△H2>△H1
H2O ( g ) = H2 ( g ) + 1/2O2 ( g ) △H = +242 kJ/mol
2H2 ( g ) + O2 ( g ) = 2H2O ( l ) △H = -484 kJ/mol
H2 ( g ) + 1/2O2 ( g ) = H2O ( g ) △H = +242 kJ/mol
2H2 ( g ) + O2 ( g ) = 2H2O ( g ) △H = +484 kJ/mol
方程式中化学计量数表示分子数
该反应的ΔH2应大于零
该反应的ΔH2=-ΔH1
该反应可表示36g液态水完全分解生成气态氢气和氧气的热效应
△H1>0,△H2<0 △H5=2△H2+△H3-△H1 △H3>0,△H5<0 △H4=△H1-2△H3
C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(g)
ΔH=-48.40kJ・mol-1
C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(l)
ΔH=-5518kJ・mol-1
C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(l)
ΔH=5518kJ・mol-1
C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(l)
ΔH=-48.40kJ・mol-1
H2(g)的燃烧热为571.6 kJ·mol-1 同质量的H2(g)和CH3OH(l)完全燃烧,H2(g)放出的热量多 1/2H2SO4(aq)+1/2Ba(OH)2(aq)===1/2BaSO4(s)+H2O(l) ΔH.=-57.3 kJ·mol-1 3H2(g)+CO2(g)=CH3OH(l)+H2O(l) ΔH.=+135.9 kJ·mol-1