【1.1】25 ℃ C2H4(g)的DcHmΘ= -1410.97kJ/mol ;CO2(g)的DfHmΘ= -393.51kJ/mol ,H2O(l)的DfHmΘ= -285.85kJ/mol;则C2H4(g)的DfHmΘ=kJ/mol
举一反三
- 25 ℃ C2H4(g)的DcHmΘ= -1410.97kJ/mol ;CO2(g)的DfHmΘ= -393.51kJ/mol ,H2O(l)的DfHmΘ= -285.85kJ/mol;则C2H4(g)的DfHmΘ=kJ/mol
- 【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
- 【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)