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?
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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