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Aqueous AB(2) decomposes according to th...

Aqueous `AB_(2)` decomposes according to the first order reaction:
`AB_(2)(aq) rarr A(g) + 2B(l)`
After `20 min` the volume of `A(g) ` colledcted during such a reaction is `20 mL`, and that collected after a very long time is `40 mL`. The rate constant is :

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