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【简答题】
PCl5遇热按PCl5(g)＝PCl3(g)+Cl2(g)式分解。2．695g PCl5装在1．00 dm3的密闭容器中，求在523 K时： (1)当总压力1000 kPa时，PCl5的分解率是多少? (2)要使分解率低于10％，总压力是多少?
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