已知298K时下列热化学方程式: ① 2NH3(g) → N2(g) + 3H2(g) △rHmΘ = 92.2kJ·mol-1② H2(g) + 1/2O2(g) → H2O(g) △rHmΘ = -241.8kJ·mol-1③ 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) △rHmΘ = -905.6kJ·mol-1试确定△fHmΘ(NH3,g,298k)=( ) kJ·mol-1
A: -90
B: -46.1
C: 90.2
D: 46.1
A: -90
B: -46.1
C: 90.2
D: 46.1
举一反三
- 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
- 已知下面四个反应的△H°298,其中液态水的标准生成热是: A: 2H(g)+O(g)=H2O(g) △rHmθ298(1) B: H2(g)+1/2 O2(g)= H2O(1) △rHmθ298(2) C: H2(g)+1/2 O2(g)= H2O(g) △rHmθ298(3) D: H2(g)+ O(g)= H2O(1) △rHmθ298(4)
- 【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
- 热化学方程式 N2(g)+3H2(g)=2NH3(g) ΔrHmӨ(298K) = -92.2 kJ·mol-1 表示
- 已知在298.15 K时,N2(g)+3H2(g)→2NH3(g)反应热为ΔrHθ= -23.06 kJ·mol-1 (ΔfHmθ(NH3,g,298.15K)=-46.11kJ·mol-1),则该反应的ξ为 mol A: 1 B: 2 C: 1/2 D: 1/4