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12 December, 00:42

The initial concentration of C2H6N2 in the first-order reaction C2H6N2→N2+C2H6 is 0.427 M. After 30. seconds, the concentration of C2H6N2 is 0.395 M. What is the rate constant k for the reaction?

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  1. 12 December, 01:02
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    2.6*10^-3 mols-1

    Explanation:

    From

    k = 2.303/t * log[A]o/[A]t

    Time taken t = 30 seconds

    Initial concentration [A]o = 0.427M

    Concentration at time (t) [A]t = 0.395M

    k = 2.303/30 * log[0.427]/[0.395]=2.6*10^-3 mols-1
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