已知: [img=48x29]1803b7cc8424f10.png[/img]H─H = 436 kJ·mol-1, [img=48x29]1803b7cc8424f10.png[/img]N≡N = 945 kJ·mol-1,[img=48x29]1803b7cc8424f10.png[/img]N─H = 389 kJ·mol-1则 N2 (g) + 3H2 (g) → 2NH3 (g)的[img=48x29]1803b7cc8424f10.png[/img]为
A: -81 kJ·mol-1
B: 81 kJ·mol-1
C: 992 kJ·mol-1
D: -992 kJ·mol-1
A: -81 kJ·mol-1
B: 81 kJ·mol-1
C: 992 kJ·mol-1
D: -992 kJ·mol-1
举一反三
- 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
- 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Δf GmӨ(AgCl)=-109.6 kJ · mol-1 ,则反应:2AgCl (s)=2Ag (s)+Cl2(g)的ΔrGmӨ 为 ( ) A: -219.2 kJ/mol B: -109.6 kJ/mol C: 219.2 kJ/mol D: 109.6 kJ/mol
- (水的相变焓的关系)水的三相点附近,其蒸发热和熔化热分别为 44.8 kJ·mol-1和 5.99 kJ·mol-1。则在三相点附近冰的升华热约为____。 A: 38.8 kJ·mol -1 B: 50.8 kJ·mol -1 C: - 38.8 kJ·mol -1 D: - 50.8 kJ·mol -1
- 在298K时,2N2(g)+O2(g)=2N2O(g),其DrUym=166.5 KJ × mol-1 ,则该反应的标准摩尔反应焓变() A. 164 KJ / mol B. 328 KJ/molC. 146 KJ × mol-1 D. 82 KJ × mol-1 A: 164KJ/mol B: 328KJ/mol C: 146KJ/mol D: 82KJ/mol