Answer to Question #210596 in General Chemistry for dee

Question

The reactant concentration in a first-order reaction was 9.70×10⁻²mol L

 after 25.0 s and 5.70×10⁻³ mol L after 85.0 s

 . What is the rate constant for this reaction?

Answer 1

The integrated rate law for the first-order reaction A → products is ln[A]_t = -kt + ln[A]_0. Because this equation has the form y = mx + b, a plot of the natural log of [A] as a function of time yields a straight line.