对下列可逆反应恒压加热，平衡移动受其影响最大的是
A: CaCO3(s)=CaO(s)+CO2(g) △rHmØ=177.9 kJ/mol
B: N2O4(g)= 2NO2(g)△rHmØ=58 kJ/mol
C: 2SO2(g)+O2(g)= 2SO3(g)△rHmØ=-198.2 kJ/mol
D: 2HI(g)= H2(g)+I2(s) △rHmØ=-52 kJ/mol
A: CaCO3(s)=CaO(s)+CO2(g) △rHmØ=177.9 kJ/mol
B: N2O4(g)= 2NO2(g)△rHmØ=58 kJ/mol
C: 2SO2(g)+O2(g)= 2SO3(g)△rHmØ=-198.2 kJ/mol
D: 2HI(g)= H2(g)+I2(s) △rHmØ=-52 kJ/mol
举一反三
- N2 ( g ) ＋ O2 ( g ) → 2 NO ( g ) ΔrHmθ ＝181.00 kJ/mol，表明该反应生成1 mol NO ( g ) 可放出 90.50 kJ/ mol 的热。
- 【单选题】已知反应: (1) CO(g) + H2O(g) = CO2(g) + H2(g) , (298K) = - 41.2 kJ/mol (2) CH4(g) + 2 H2O(g)= CO2(g) + 4 H2(g), (298K) = 165.0 kJ/mol 则 CH4(g) + H2O(g) = CO(g) + 3 H2(g) 的 (298K) = 。 A. - 206.2 kJ/mol B. 123.8 kJ/mol C. 206.2 kJ/mol D. - 123.8 kJ/mol
- 【单选题】已知298K时,∆ f H θ (HI,g)=-25.9 kJ.mol -1 ,下列说法正确的是() A. 0.5 mol H 2 (g)和0.5 mol I 2 (g)的混合物在101.325kPa和298K时生产HI(g)的反应热为-25.9 kJ﹒mol -1 B. H 2 (g)+ I 2 (g) = 2HI(g)反应的标准焓变在298K时为-25.9 kJ﹒mol -1 C. 反应H 2 (g)+ I 2 (s) = 2HI(g)在298K时的标准焓变为-25.9 kJ﹒mol -1 D. 反应1/2H 2 (g)+ 1/2 I 2 (s) = HI(g) 在298K时的标准焓变为-25.9 kJ﹒mol -1
- 已知H2O(g) = H2(g) +0.5O2(g)，ΔrHm(1) = 241.8 kJ·mol–1；H2(g) = 2H(g)，ΔHm(2) = 436.0 kJ·mol–1；0.5O2(g) = O(g)，ΔHm(3)=247.7 kJ·mol–1则H2O中H–O键的平均键焓(单位：kJ·mol–1)为（） A: 462.8 B: 925.5 C: –462.8 D: 241.8
- 表示CO2生成热的反应是 ( ) A: CO (g) + 1/2O2 (g) = CO2 (g) ΔrHmθ = –238.0 kJ·mol–1 B: C (金刚石) + O2 (g) = CO2 (g) ΔrHmθ = –395.4 kJ·mol–1 C: 2C (金刚石) + 2O2 (g) = 2CO2 (g) ΔrHmθ = –787.0 kJ·mol–1 D: C (石墨) + O2 (g) = CO2 (g) ΔrHmθ = –393.5 kJ·mol–1