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a<c<0 b>d>0 2a=b<0 2c=d>0
-285.8kJ/mol 285.8kJ/mol -241.8kJ/mol 241.8kJ/mol
H2燃烧生成1 mol H2O(g)时,放出241.8 kJ的热量 O2前面的表示参加反应的O2的分子数目
241.8 kJ/mol 483.6 kJ/mol 285.8 kJ/mol 571.6 kJ/mol
2.43 kJ 4.86 kJ 43.8 kJ 87.5 kJ
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
Q1+Q2+Q3 0.5Q3-Q2+2Q1 0.5Q3+Q2-2Q1 0.5(Q1+Q2+Q3)
a<c <0 b>d>0 2a=b<0 2c=d>0
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
4a+4b+4c 2a-2b+6c 2a-2b+2c 2a-6b+2c
-82kJ/mol -41kJ/mol -312kJ/mol +82kJ/mol
H2O(g)=H2(g)+ 1/2O2 (g)△H=+242 kJ.mol-1 2H2(g)+O2(g)=2H2O(l) △H= -484 kJ.mol-l H2(g)+ 1/2O2(g)=H2O(g) △H=+242 kJ.mol-l 2H2(g) + O2(g) = 2 H2O(g) △H= -484 kJ