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Concentration Changes Over Time

AP Chemistry· difficulty 4/5

For a zero-order reaction with k=0.020k = 0.020 M/s, [A]0_0 = 1.00 M. Time for [A] to reach 0.50 M is

  • A

    10 s

  • B

    25 s (t=([A]0−[A])/kt = ([A]_0 - [A])/k)

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  • C

    50 s

  • D

    100 s

Explanation

Zero-order: [A]=[A]0−kt[A] = [A]_0 - kt. 0.50=1.00−0.020t0.50 = 1.00 - 0.020 t, t=25t = 25 s.

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