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a<c<0 b>d>0 2a=b<0 2c=d>0
12△H3+5△H2-2△H1 2△H1-5△H2-12△H3 12△H3-5△H2-2△H1 △H1-5△H2-12△H3
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
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
12ΔH.3+5ΔH.2-2ΔH.1 2ΔH.1-5ΔH.2-12ΔH.3 12ΔH.3-5ΔH.2-2ΔH.1 ΔH.1-5ΔH.2-12ΔH.3
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
H2O ( g ) = H2 ( g ) + 1/2O2 ( g ) △H = +242 kJ/mol 2H2 ( g ) + O2 ( g ) = 2H2O ( l ) △H = -484 kJ/mol H2 ( g ) + 1/2O2 ( g ) = H2O ( g ) △H = +242 kJ/mol 2H2 ( g ) + O2 ( g ) = 2H2O ( g ) △H = +484 kJ/mol
已知C.(石墨, s)=C(金刚石, s) ΔH>0,则金刚石比石墨稳定 已知S(s)+O2(g)=SO2(g) ΔH1 ;S(g)+O2(g)=SO2(g) ΔH2,则ΔH1>ΔH2 已知2H2(g)+O2(g)=2H2O(g) ΔH= -483.6 kJ/mol,则氢气的燃烧热为241.8kJ/mol 已知NaOH(aq)+HCl(aq)=NaCl(aq)+H2O(l) ΔH=-57.3kJ/mol,则含20gNaOH的稀溶液与稀盐酸完全中和,中和热为28.65kJ/mol
12ΔH3+5ΔH2-2ΔH1 2ΔH1-5ΔH2-12ΔH3 12ΔH3-5ΔH2-2ΔH1 ΔH1-5ΔH2-12ΔH3
12ΔH.3+5ΔH.2-2ΔH.1 2ΔH.1-5ΔH.2-12ΔH.3 12ΔH.3-5ΔH.2-2ΔH.1 ΔH.1-5ΔH.2-12ΔH.3
C6H12O6(l)+6O2(g)=6CO2(g)+6H2O(g) ΔH= -15.58kJ・mol-1
C6H12O6(l)+6O2(g)=6CO2(g)+6H2O(l) ΔH= -2804kJ・mol-1
C6H12O6(l)+6O2(g)=6CO2(g)+6H2O(l) ΔH= +2804kJ・mol-1
C6H12O6(l)+6O2(g)=6CO2(g)+6H2O(l) ΔH= -15.58kJ・mol-1
12ΔH. 3+10ΔH. 2﹣2ΔH. 1 2ΔH. 1﹣10ΔH. 2﹣12ΔH. 3 12ΔH. 3﹣10ΔH. 2﹣2ΔH. 1 ΔH. 1﹣10ΔH. 2﹣12ΔH. 3
12△H3+5△H2-2△H1 2△H1-5△H2-12△H3 12△H3-5△H2-2H1 △H1-5△H2-12△H3
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