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
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
- 【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
- 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 DfGmΘ（AgCl）= - 109.8 kJ · mol–1， 则反应 2 AgCl (s) = 2 Ag (s) + Cl2 (g) 的 DrGmΘ 应为 () A: 219.6 kJ·mol-1 B: 109.8 kJ·mol-1 C: –109.8 kJ·mol-1 D: –219.6 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