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2H2(g)+O2(g) == 2H2O(1) △H.= -285.8 kJ/mol 2H2(g)+ O2(g) == 2H2O(1) △H.= +571.6 kJ/mol 2H2(g)+O2(g) == 2H2O(g) △H.= -571.6 kJ/mol H2(g)+O2(g) == H2O(1) △H.= -285.8 kJ/mol
2H2(g)+O2(g) === 2H2O(l) △H=-285.8KJ·mol-1 2H2(g)+O2(g) === 2H2O(l) △H=+285.8KJ·mol-1 H2(g)+O2(g) === H2O(l) △H=-285.8KJ·mol-1 H2(g)+ O2(g) === H2O(g) △H=-285.8KJ·mol-1
H2O(g)=H2(g)+1/2O2(g) △H.(298K)=+242KJ/mol 2H2(g)+O2(g)=2H2O(1) △H.(298K)=-484KJ/mol H2(g)+1/2O2(g)=H2O(g) △H.(298K)=+242KJ/mol 2H2(g)+O2(g)=2H2O(g) △H.(298K)=+484KJ/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
Δ H3=ΔH1+2ΔH2 Δ H3=ΔH1+ΔH2 Δ H3=ΔH1-2ΔH2 Δ H3=ΔH1-ΔH2
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
⊿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 =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
283. kJ·mol-1 +172.5 kJ·mol-1 -172.5 kJ·mol-1l -504 kJ·mol-1
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
ΔH3=ΔH1+2ΔH2 ΔH3=ΔH1+ΔH2 ΔH3=ΔH1-ΔH2 ΔH3=ΔH1-2ΔH2