【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
A. - 206.2 kJ/mol B. 123.8 kJ/mol C. 206.2 kJ/mol D. - 123.8 kJ/mol
举一反三
- 【单选题】由下列数据确定CH 4 (g)的为Δ f H m Θ 为 () C ( 石墨 ) +O 2 (g)=CO 2 (g) Δ r H m Θ =-393.5kJ·mol - 1 H 2 (g)+1/2O 2 (g)=H 2 O(l) Δ r H m Θ =-285.8kJ·mol - 1 CH 4 (g)+2O 2 (g)=CO 2 (g)+2H 2 O ( l ) Δ r H m Θ =-890.3kJ·mol - 1 A. 211 kJ·mol -1 B. -74.8kJ·mol - 1 C. 890.3 kJ·mol - 1 D. 缺条件,无法算
- 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
- 【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 (l) = H2 (g) +1/2 O2 (g) DrHmy = 285.8 kJ·mol–1 则反应2 H2 (g) + O2 (g) = 2H2O (l) 的 DrHmy 为 ( ) A: 285.8 kJ·mol–1 B: - 285.8 kJ·mol–1 C: 571.6 kJ·mol–1 D: - 571.6 kJ·mol–1
- 已知C 2H 6(g)+7/2O 2(g) = 2CO 2(g) +3H 2O(l),C 2H 6(g)、CO 2(g)、H 2O(l)的Δ fH m y(kJ·mol -1)分别为:-85、-394、-286,试求上述反应的Δ rH m y为______。 A: -85+394+286(kJ·mol -1) B: -394+85-286(kJ·mol -1) C: -85-2×(-394)-3×(-286)(kJ·mol -1) D: 2×(-394)+3×(-286)-(-85)(kJ·mol -1)