已知物质 C2H4(g) CO(g) H2O(g) ∆fHmƟ/kJ·mol-1 52.3 -110.5 -242.0 则反应:C2H4(g) + 2O2(g) = 2CO(g) + 2H2O(g) 的∆rHmƟ为
A: -300 kJ·mol-1
B: -652 kJ·mol-1
C: -405 kJ·mol-1
D: -757 kJ·mol-1
A: -300 kJ·mol-1
B: -652 kJ·mol-1
C: -405 kJ·mol-1
D: -757 kJ·mol-1
举一反三
- 中国大学MOOC: 已知物质 C2H4(g) CO(g) H2O(g) ∆fHmƟ / kJ·mol-1 52.3 -110.5 -242.0 则反应:C2H4(g) + 2O2(g) = 2CO(g) + 2H2O(g) 的∆rHmƟ为
- 【单选题】由下列数据确定CH 4 (g)的为Δ f H m Θ 为 () C ( 石墨 ) +O 2 (g)=CO 2 (g) Δ r H m Θ =-393.5kJ·mol - 1 H 2 (g)+1/2O 2 (g)=H 2 O(l) Δ r H m Θ =-285.8kJ·mol - 1 CH 4 (g)+2O 2 (g)=CO 2 (g)+2H 2 O ( l ) Δ r H m Θ =-890.3kJ·mol - 1 A. 211 kJ·mol -1 B. -74.8kJ·mol - 1 C. 890.3 kJ·mol - 1 D. 缺条件,无法算
- 已 知 C (s) + 1/2O2(g) → CO (g) 的△rHmθ= -110.5 kJ·mol-1,C (s) +O2(g) → CO2 (g) 的△rHmθ= -393.5 kJ·mol-1, 则 CO (g)+ 1/2O2(g) → CO2(g) 的△rHmθ=..........................( )。 A: -283.0 kJ·mol-1; B: 283.0 kJ·mol-1; C: -110.5 kJ·mol-1; D: -504.0 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