Initial concentration of reactant X of a first-order reaction is 0.80 M. The concentration is 0.20 M after 153 second so what is the rate law of this reaction?

Question

aaronq · Answer

are you sure they want the rate law? they're telling you that it's a first-order reaction in the question. Do you know how to find k?

aaronq · Answer

You can find k in several ways, the easiest is to use the integrated rate-law:

$\large ln[A]_t=-kt+ln[A]_o$

where $ln[A]_o$ is the initial concentration of the substance
$k$ is the rate constant
$t$ is time
$ln[A]_t$ is the concentration of substance at time $t$