【单选题】已知1 A + B—→ C + D,△rHm,1=-40.0KJ·mol,22C + 2D—→ E, △rHm,2=60.0KJ·mol,则反应3E—→ 2A+2B的△rHm,3等于()
A. 140KJ·mol+1 B. -140 KJ·mol+1 C. -20 KJ·mol+1 D. 20 KJ·mol
A. 140KJ·mol+1 B. -140 KJ·mol+1 C. -20 KJ·mol+1 D. 20 KJ·mol
举一反三
- ∆fHmӨ(AgBr, s)= −100.37 kJ·mol−1, 则反应: 2AgBr (s) → 2Ag (s) + Br2(l)的∆rHmӨ为 A: −100.37 kJ·mol−1; B: −200.74 kJ·mol−1; C: 100.37 kJ·mol−1; D: 200.74 kJ·mol−1
- 已知在298K时反应2N2(g) + O2(g) = 2N2O(g)的ΔrHmθ为164 kJ·mol–1，则该反应的ΔrUmθ为 A: 166.5 kJ·mol–1 B: 328 kJ·mol–1 C: 146 kJ·mol–1 D: 161.5 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
- 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。
- 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