A.2H2(g)+ O 2(g) =" "2H2O(1)H =" "—142.9kJ·molˉl |
B.2H2(g)+ O 2(g) =" "2H2O(1)H =" "—571.6kJ·molˉl |
C.2H2+O2 = 2H2OH = —571.6lkJ·molˉl |
D.H2(g)+O 2(g) = H2O(1)H = +285.8kJ·molˉl |
化学键 | Cl-Cl | H—H | H—Cl | N≡N |
键能/kJ·mol | 243 | 436 | 431 | 946 |
A.1 mol氢气和1 mol碘蒸气完全反应需要吸收26 kJ的热量 |
B.1个氢分子和1个碘分子完全反应需要吸收52 kJ的热量 |
C.1 mol H2(g)与1 mol I2(g)完全反应生成2 mol的HI气体需吸收52 kJ的热量 |
D.mol H2(g)与mol I2(g)完全反应放出26 kJ的热量 |
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