MCAS Chemistry Exam Practice

Category - Chemistry

Gold-198 has a half-life of approximately 3 days. If a 100 g sample of gold-198 decays for 9 days, approximately how much gold-198 remains in the sample?
  1. 13 g
  2. 25 g
  3. 33 g
  4. 50 g
Explanation
Answer: A - 13 g
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