Reviewed CSCA Chemistry question · Easy

在恒温恒容密闭容器中，发生反应：2A(g) + B(g) ⇌ 2C(g)。起始时充入2 mol A和1 mol B，达到平衡时测得C的物质的量为1.2 mol。则B的转化率为多少？

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Correct answer

B. 60%

Principle or equation

根据化学方程式计量关系，由C的生成量计算消耗的B，转化率=消耗量/起始量×100%。

Why this answer is correct

生成1.2 mol C，消耗B的物质的量为1.2 mol÷2=0.6 mol。B的转化率=0.6 mol/1 mol×100%=60%。

Example

若反应为A+2B⇌2C，生成2mol C则消耗B 2mol。

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