Answer: Using the Integrated First-Order Rate LawThe
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Problem 2PE
Using the Integrated First-Order Rate Law
The decomposition of a certain insecticide in water at 12 °C follows first-order kinetics with a rate constant of 1.45 yr-1. A quantity of this insecticide is washed into a lake on June 1. leading to a concentration of 5.0 x 10-7 g/cm3. Assume that the temperature of the lake is constant (so that there are no effects of temperature variation on the rate), (a) What is the concentration of the insecticide on June 1 of the following year? (b) How long will it take for the insecticide concentration to decrease to 3.0 x 10-7 g/cm3?
The decomposition of dimethyl ether. (CH3)20. at 510 CC is a first-order process with a rate constant of 6.8 x 10-4 s-1:
(CH3)20(g)—CH4(g) + H2(g) + CO (g)
If the initial pressure of (CH3)20 is 135 torr. what is its pressure after 1420 s?
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