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(9分)(1)1 mol气态钠离子和1 mol气态氯离子结合生成1 mol氯化钠晶体释放出的热能为氯化钠晶体的晶格能。 ①下列热化学方程式中，能直接表示出氯化钠晶体晶格能的是____________。 A．Na ＋ (g)＋Cl － (g)―→NaCl(s)；△Q B．Na(s)＋Cl 2 (g)―→NaCl(s)；△Q 1 C．Na(s)―→Na(g)；△Q 2 D．Na(g)－e － ―→Na ＋ (g)；△Q 3 E.Cl 2 (g)―→Cl(g)；△Q 4 F．Cl(g)＋e － ―→Cl － (g)；△Q 5 ②写出△Q 1 与△Q、△Q 2 、△Q 3 、△Q 4 、△Q 5 之间的关系式________________________________________________________________________ (2)可逆反应：aA(g)＋bB(g) cC(g)＋dD(g)，取a mol A和b mol B置于V L密闭容器中，2 min后，测得容器中A的浓度为x mol·L －1 ，以物质C的浓度变化来表示这段时间内反应的平均速率应为__________ __。
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