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【简答题】
一定温度下，将2mol A和2mol B两种气体混合于体积为2 L的某恒容的密闭容器中，发生如下反应： 3A(g)+B(g) xC(g)＋2D(g)， ＜0，2min 末反应达到平状态（温度不变），生成了0．8 mol D，并测得C的浓度为0．4 mol/L，请填写下列空白： （1）X的值等于_________， （2）该反应的化学平常数K=_________，升高温度时K值将_________（填“增大”、“减小”、“不变”） （3）A物质的转化率为_________。 （4）若维持温度不变，在原平混合物的容器中再充入3mol C和3mol D，欲使达到新的平时，各物质的物质的量分数与原平相同，则至少应再充入B的物质的量为_________mol；达新平时，A的物质的量为n（A）=_________mol。
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