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-285.8kJ/mol 285.8kJ/mol -241.8kJ/mol 241.8kJ/mol
甲烷的燃烧热为890.3 kJ·mol-1,则甲烷燃烧的热化学方程式可表示为:CH4(g)+2O2(g)===CO2(g)+2H2O(g) ΔH=-890.3 kJ·mol-1 500 ℃、30 MPa下,将0.5 mol N2和1.5 mol H2置于密闭容器中充分反应生成NH3(g),放热19.3 kJ,其热化学方程式为N2(g)+3H2(g)2NH3(g) ΔH=-38.6 kJ·mol-1 已知在120 ℃、101 kPa下,1 g H2燃烧生成水蒸气放出121 kJ热量,其热化学方程式为H2(g)+1/2O2(g)===H2O(g) ΔH=-242 kJ·mol-1 25 ℃、101 kPa时,强酸与强碱的稀溶液发生反应的中和热为57.3 kJ·mol-1,硫酸稀溶液与氢氧化钾稀溶液反应的热化学方程式为:H2SO4(aq)+2KOH(aq)= K2SO4(aq)+2H2O(l) ΔH=-114.6 kJ·mol-1
H2O(g)=H2(g)+1/2 O2(g) ΔH=+242 kJ/mol 2 H2(g)+O2(g)=2 H2O(g) ΔH=-484 kJ/mol H2(g)+1/2 O2(g)=H2O(g) ΔH=+242 kJ/mol 2 H2(g)+O2(g)=2 H2O(g) ΔH=+484 kJ/mol
CO(g) +1/2O2(g) ==CO2(g) △H.=-283.0 kJ/mol C(s) +1/2O2(g) ==CO(g) △H.=-110.5 kJ/mol H2(g) +1/2O2(g)==H2O(g) △H.=-241.8 kJ/mol 2C8H18(l) +25O2(g)==16CO2(g)+18H2O(l) △H.=-11036 kJ/mol
CO(g) +1/2O2(g) ==CO2(g); △H.=-283.0 kJ/mol C(s) +1/2O2(g) ==CO(g); △H.=-110.5 kJ/mol H2(g) +1/2O2(g)==H2O(g); △H.=-241.8 kJ/mol 2C8H18(l) +25O2(g)==16CO2(g)+18H2O(l); △H.=-11036 kJ/mol
S.(s)+O2(g)= SO2(g);△H=-269.8kJ/mol 中和热的热化学方程式:NaOH(aq)+HCl(aq)= NaCl(aq)+H2O(l);△H=+57.3kJ/mol 燃烧热的热化学方程式: C2H5OH(l)+3O2(g)= 2CO2(g)+3H2O(g);△H=-1367.0 kJ/mol 2NO2 = O2+2NO;△H = +116.2kJ/mol
由反应①、②可知如图所示的热化学方程式为CO(g)+H2O(g)==== CO2(g)+H2(g)ΔH = -41.2 kJ·mol-1 H2的燃烧热为241.8 kJ·mol-1 H2(g)转变成H2O(g)的化学反应一定要释放能量 根据②推知反应H2(g)+1/2O2(g)==== H2O(l)ΔH > -241.8 kJ·mol-1
C.+ H2O == CO + H2 ∆H= +131.3 kJ mol H -1 C(s)+ H2O(g) == CO(g) + H2(g) ∆H= +10.94 kJ·mol -1 C(s)+ H2O(l) == CO(g) + H2(g) ∆H= +131.3 kJ· mol -1 C(s)+ H2O(g) == CO(g) + H2(g)∆H= +131.3 kJ· mol -1
2H2(g) + O2(g)= 2H2O(g) △H1 ; 2H2(g) + O2(g) = 2H2O(l) △H2 S(g) + O2(g) =SO2(g) △H1 ; S(s) + O2(g) = SO2(g) △H2 CO(g) + 1/2 O2(g) = CO2(g) △H1 ;2CO(g) + O2(g) = 2CO2(g) △H2 C.(s)+H2O(g)=CO(g)+H2(g) △H1 ;CaO(s)+H2O(l)===Ca(OH)2(s) △H2
表示硫的燃烧热的热化学方程式S(s)+O2(g)=SO3(g);ΔH.=-315 kJ·mol-1 表示中和热的热化学方程式NaOH(aq)+HCl(aq)=NaCl(aq)+H2O(l); ΔH.=-57.3 kJ·mol-1 表示H2燃烧热的热化学方程式H2(g)+O2(g)=H2O(g);ΔH.=-241.8 kJ·mol-1 表示CO燃烧热的热化学方程式2CO(g)+O2(g)=2CO2(g);ΔH.=-566 kJ·mol-1
C+H2O=CO+H2 ΔH = +10.9 kJ/ mol C(s)+H2O(g)=CO(g)+H2(g) ΔH = +10.94 kJ/ mol C(s)+H2O(g)=CO(g)+H2(g) ΔH = +131.28 kJ/ mol 1/2C(s)+ 1/2H2O(g)= 1/2CO(g)+ 1/2H2(g ) ΔH = + 65.64 kJ/ mol