题干

将4molA气体和2molB气体在2L的容器中混合并在一定条件下发生如下反应:
2A(g)+B(g)2C(g),若经2 s(秒)后测得C的浓度为0.6 mol·L1,现有下列几种说法:
①用物质A表示的反应的平均速率为0.3 mol·(L·s)-1
②用物质B表示的反应的平均速率为0.6 mol·(L·s)-1
③2 s时物质A的转化率为70%
④2 s时物质B的浓度为0.7 mol·L1  其中正确的是(  )

A:①③

B:①④

C:②③

D:③④

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答案(点此获取答案解析)

B

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