The rate constant of a first order reaction is 6.8 x 10⁻⁴ s⁻¹. If the initial concentration of reactant is 0.04 M, what is its molarity after 20 minutes? How long will it take for 25% of reactant to react?
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The formula that will be used is 2.303/k log [R]n/[R]
Here, 2.303/6.8 * 10-4 log [0.04]/[R]
This formula will be used for the calculation of the total time taken in the performance of the first order reaction.
Hence, since you know the time and the concentration you can calculate the R that can be used in the above equation.
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