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AI+H2S04 =AIS04+ H2 t 2Al+3H2S04==—AI(S04)3 +H2 t ' 2AI+3H2S04 =AI2(S04)3 +3H2 f 3A1+ H2 S04==Alz S04+ H2
ΔH1>ΔH2 ΔH1=ΔH2 ΔH1<ΔH2 无法计算
S+KOH→K2SO3+K2S+H2O FeO+HNO3→Fe(NO3)3+H2O Cu20+H2SO4→CuSO4+Cu+H2O NH4NO3→N2O↑+H2O
C2H4(g)+H2(g)=C2H6(g) ΔH=-Q1,C3H6(g)+H2(g)=C3H8(g) ΔH=-Q2
2H2(g)+O2(g)=2H2O(l) ΔH=-Q1,2H2(g)+O2(g)=2H2O(g) ΔH=-Q2
S(s)+O2(g)=SO2(g) ΔH=-Q1,S(g)+O2(g)=SO2(g) ΔH=-Q2
C(s)+1/2O2(g)=CO(g) ΔH=-Q1,C(s)+O2(g)=CO2(g) ΔH=-Q2
S(s) + O2 (g) =SO2 (g); △H1 S(g) + O2 (g) =SO2 (g);△H2 2H2(g) + O2 (g)= 2H2O(g);△H1 2H2 (g) + O2 (g) = 2H2O(l);△H2 CO(g) + 1/2 O2(g) = CO2(g);△H1 2CO(g) + O2(g) = 2CO2(g);△H2 H2 (g) +Cl2(g)=2HCl(g);△H1 1/2 H2(g) + 1/2 Cl2(g) = HCl(g);△H2
C.+ H2O == CO + H2 ∆H= +131.3 kJ mol H -1 C(s)+ H2O(g) == CO(g) + H2(g) ∆H= +10.94 kJ·mol -1 C(s)+ H2O(l) == CO(g) + H2(g) ∆H= +131.3 kJ· mol -1 C(s)+ H2O(g) == CO(g) + H2(g)∆H= +131.3 kJ· mol -1
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
25℃ 101kPa时,CH4(g)+2O2(g)=CO2(g) +2H2O(g) △H=-Q kJ/mol, 则甲烷的燃烧热为Q kJ/mol CaCO3(s)=CaO(s)+CO2(g) 室温下不能自发进行,说明该反应的 ΔH<0 反应N2(g)+3H2(g)2NH3(g)ΔH<0达到平衡后,升高温度,反 应速率v(H2)和H2的平衡转化率均增大 已知氯气、溴蒸气分别跟氢气反应的热化学方程式如下(Q1、Q2的值 均大于零): H2(g) +Cl2(g)=2HCl(g) △H1=—Q1 kJ/mol H2(g) +Br2(g)=2HBr(g) △H2=—Q2 kJ/mol 则△H1<△H2
S(s)+O2(g)=SO2(g) △H1,S(g)+O2(g)=SO2(g) △H2;则:△H1<△H2 C.(石墨,s)=C(金刚石,s) △H=+1.9kJ/mol,则:由石墨制取金刚石的反应是吸热反应,金刚石比石墨稳定 NaOH(aq)+HCl(aq)=NaCl(aq)+H2O(l) △H= ―57.4kJ/mol,则:含20gNaOH的溶液与稀盐酸完全反应,放出的热量为28.7kJ CaCO3(s)=CaO(s)+CO2(g) △H>0,△S>0,则:该反应任何温度下都能自发进行