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a<c<0 b>d>0 2a=b<0 2c=d>0
已知2H2(g)+O2(g)===2H2O(g) ΔH.=-483.6 kJ· mol-1说明2 mol H2(g)和1 mol O2(g)的能量总和小于2 mol H2O(g)的能量 已知 (s,石墨)===C(s,金刚石) ΔH.>0,则金刚石比石墨稳定 C.已知NaOH(aq)+HCl(aq)===NaCl(aq)+H2O(l) ΔH.=-57.4 kJ·mol-1, 则含20 g NaOH的稀溶液与稀盐酸完全中和,放出28.7 kJ的热量 已知2C(s)+2O2(g)===2CO2(g) ΔH.1 2C(s)+O2(g)===2CO(g) ΔH.2,则ΔH.1>ΔH.2
ΔH1>0,ΔH3<0 ΔH2>0,ΔH4>0 ΔH1=ΔH2+ΔH3 ΔH3=ΔH4+ΔH5
H2O(g) = H2(g) + 1/2 O2 (g) △H = +242 kJ/mol 2H2(g) + O2 (g) = 2H2O (l) △H = -484 kJ/mol H2 (g) + 1/2 O2 (g) = H2O (g) △H = -242 kJ 2H2 (g) + O2 (g) = 2H2O (g) △H = +484 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=△H1+2△H2 △H3=△H1+△H2 △H3=△H1﹣2△H2 △H3=△H1﹣△H2
ΔH3=ΔH1+ΔH2 ΔH3=ΔH1+2ΔH2
ΔH3=ΔH1-2ΔH2 ΔH3=ΔH1-ΔH2
ΔH3=ΔH1+2ΔH2 ΔH3=ΔH1+ΔH2 ΔH3=ΔH1-2ΔH2 ΔH3=ΔH1-ΔH2
Δ H3=ΔH1+2ΔH2 Δ H3=ΔH1+ΔH2 Δ H3=ΔH1-2ΔH2 Δ H3=ΔH1-ΔH2
△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
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
2ΔH1 + 2ΔH2 - 2ΔH3 ΔH1 + ΔH2 - ΔH3 3ΔH1 + 2ΔH2 + 2ΔH3 3ΔH1 + 2ΔH2 - 2ΔH3