已知:( bigcirc (1)C(H)_(5)OH(g)+dfrac (1)(2)(O)_(2)(g)=C(O)_(2)(g)+2(H)_(2)(g) Delta H=-192.9kJ/mol-|||-② _(2)(g)+dfrac (1)(2)(O)_(2)(g)=(H)_(2)O(l) Delta H=-285.8kJ/mol-|||-则 (H)_(3)OH(g)+dfrac (3)(2)(O)_(2)(g)=C(O)_(2)(g)+2(H)_(2)O(l) Delta H 为(-|||-

18.已知:-|||-①H2O(g)=H2(g)+2O2(g) H=+241.88kJ/mol-|||-②C(s)+2O2(g )=CO(g) △H=-110.

_(2)(H)_(5)OH(g)+(H)_(2)O(g)=2(H)_(2)(g)+C(H)_(2)COOH(g) Delta (H)_(1) K-|||-Ⅱ

判断反应 _(2)(H)_(5)OH(g)=(C)_(2)(H)_(4)(g)+(H)_(2)O(g)-|||-已知 Delta (H)_(m)O(kJ/mol

_(2)(g)+dfrac (1)(2)(O)_(2)(g)=!=!= (H)_(2)O(1) Delta (H)_(2)=-285.5kJ-|||-cdot

Delta (H)_(1)=akJcdot (mol)^-1-|||-反应Ⅱ: (g)+(H)_(2)O(g)leftharpoons C(O)_(2)(g)+

_(2)(H)_(6)(g)=!=!= (C)_(2)(H)_(4)(g)+(H)_(2)(g) Delta (H)_(1)=+137kJcdot (mol)

2.13 已知下列反应在298K时的标准摩尔焓变:-|||-(1) (C)_(2)(H)_(2)(g)+5(O)_(2)(g)=4C(O)_(2)(g)+2(H

[单选题]已知：2H2（g）+ O2(g)=2H2O(l) ΔH= -571.6KJ· mol-1C．H4（g）+ 2O2(g)＝CO2(g)＋2H2O(l) ΔH= -890KJ· mol-1现有H2与CH4的混合气体112L（标准状况），使其完全燃烧生成CO2和H2O(l),若实验测得反应放热3695KJ，则原混合气体中H2与CH4的物质的量之比是A．1∶1 B．1∶3C．1∶4 D．2∶3

(H)_(2)(g)+(O)_(2)(g)=!=!= 2(H)_(2)O(l) Delta (H)_(3)=-572kJcdot mo(l)^-1-|||-_

(rm C(g)+H_2O(g) {!=!=!=) CO（g）+H_2(g)} Delta H_2iii.(rm C(s)+2H_2(g) {!=!=!