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Consider a reaction that is first order ...

Consider a reaction that is first order in both direction
`A overset(k_f)underset(k_b)hArr B`
Initially only A is present , and its concentration is `A_0`. Assume `A_t` and `A_(eq)` are the concentrations of A at time 't' and at equilibrium, respectively. The time 't at which `A_t = (A_0 + A_(eq))//2 is`,

A

`t = (ln(3/2))/((kf + kb))`

B

`t=(ln(3/2))/((k_f-k_b))`

C

`t= (ln2)/((k_f + k_b))`

D

`t = (ln2)/((k_f +k_b))`

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