At 25 degrees, the rate constant for the first order decomposition of a pesticide solution is 6.40 x 10^-2 min^-2. if the starting concentration of pesticide is 0.0314 m, what concentration will remain after 62.0 min at 25 degree celsius?

the correct answer is 2.11 x 10^2 m, show the steps.

If the initial amount is 1, the amount remaining at time t is exp(-rt), where r is the rate constant (.0064), and t is the time (62). The value of the exponential is 0.6725, and doing the obvious multiplication gives .0211 mole.

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The answer is b i think