Zinc-65 has a half-life of 245 days. (a) What % of the original activity remains after 100 days? (b) How much time is required for the activity to reduce to 5% of the initial activity?

University of Ilorin CHM101 practiceOwulade past question

  1. (a) 73.5%, (b) 1063 days
  2. (a) 63.5%, (b) 1063 days
  3. (a) 53.5%, (b) 1000 days
  4. (a) 83.5%, (b) 963 days

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