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Concentration Changes Over Time

AP Chemistry· difficulty 4/5

A first-order reaction with t1/2=50t_{1/2} = 50 s — what fraction remains after 200 s?

  • A

    1/16 (4 half-lives)

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  • B

    1/2

  • C

    1/8

  • D

    1/4

Explanation

200/50=4200/50 = 4 half-lives. Fraction remaining = (1/2)4=1/16(1/2)^4 = 1/16.

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