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A certain first-order rxn A->products has a half life of 677 seconds. What % of an initial amount of the reactant will remain unreacted after 400 sec?

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The half life of a first order reaction can be solved using the expression:

`t(1/2) = (ln(2))/(k)`

since we are given the value of the t1/2, we can solve the value of k.

`k = (ln(2))/(t 1/2)`

`k = (ln(2))/(667seconds)`

`k = 0.0010391...

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