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(1)已知：H 2 (g)＋1/2O 2 (g)=H 2 O(l) ΔH＝－285.8 kJ·mol － 1 H 2 (g)=H 2 (l) ΔH＝－0.92 kJ·mol － 1 O 2 (g)=O 2 (l) ΔH＝－6.84 kJ·mol － 1 H 2 O(l)=H 2 O(g) ΔH＝＋44.0 kJ·mol － 1 请写出液氢和液氧反应生成气态水的热化学方程式：__________________________ 电解质溶液为KOH溶液的氢氧燃料电池，其负极的电极反应式为____________________________________。 (2)如图表示373 K时，反应A(g) 2B(g)在前110 s内的反应进程。 ①此反应的平衡常数表达式K＝________。 ②373 K时反应进行到70 s时，改变的条件可能是________，反应进行到90 s时，改变的条件可能是________。 A．加入催化剂 B．扩大容器体积 C．升高温度 D．增大A的浓度 ③请在图中画出反应物A在0～70 s时的浓度变化曲线。
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