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
内容
- 0
【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
- 1
已知MnO2 (s) = MnO (s) + 1/2 O2 (g) r HmΘ = 134.8 kJ∙mol−1,MnO2 (s) + Mn (s) = 2MnO (s) r HmΘ = -250.1 kJ∙mol−1,则MnO2的标准摩尔生成热f HmΘ为( ) A: -519.7 kJ∙mol−1 B: 519.7 kJ∙mol−1 C: 317.5 kJ∙mol−1 D: -317.5 kJ∙mol−1
- 2
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
- 3
已知反应B4C(s)()+4O2(g)()=2B2O3(s)()+CO2(g)的ΔrHmΘ=-2859()kJ·mol-1;而且ΔfHmΘ(B2O3)()=()-1273()kJ·mol-1;ΔfHmΘ(CO2)()=()-393()kJ·mol-1。则ΔfHmΘ(B4C)为()。A.()-()2859()kJ·mol()-()1B.()-()1666()kJ·mol()-()1C.()1666()kJ·mol()-()1D.()-()80.0()kJ·mol()-()1
- 4
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)