反应2SO2+O2 2SO2经一段时间后,SO3的浓度增加了0.4mol・L-1,在这段时间

反应2SO2+O2 2SO2经一段时间后,SO3的浓度增加了0.4molL-1,在这段时间内用O2表示的反应速率为0.04molL-1s-1,则这段时间为             

A0.1s                           B2.5s                    C5s                       D10s

答案

C

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