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在298K、100kPa时,已知:2H2O(g)=O2(g)+2H2(g)△H1 Cl2(g)+H2(g)=2HCl(g )△H2 2Cl2(g)+2H2O(g)=4HCl(g)+O2(g...

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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  
H2Og=H2g+1/2O2g △H.298K=+242KJ/mol  2H2g+O2g=2H2O1 △H.298K=-484KJ/mol  H2g+1/2O2g=H2Og △H.298K=+242KJ/mol  2H2g+O2g=2H2Og △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  

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