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Reviewed CSCA Chemistry question · Standard

在恒温恒容密闭容器中,反应 A(g) + 2B(g) ⇌ 2C(g) 达到平衡后,再向容器中充入一定量的惰性气体(不参与反应),则正反应速率将?

  1. 增大
  2. 减小
  3. 不变
  4. 无法判断
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Correct answer

C. 不变

Principle or equation

恒容条件下充入惰性气体,各反应物和生成物浓度不变,反应速率不变。

Why this answer is correct

恒容时充入惰性气体,容器体积不变,各物质浓度不变,因此正反应速率不变。

Example

在密闭容器中充入氦气,容器体积不变,反应物浓度不变,速率不变。

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