A freshly isolated sample of 90Y was found to have an activity of 8.5 x 105 disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on 90 December 17, 2006, its activity was measured again and found to be 2.3 × 10 disintegrations per minute. Calculate the half-life of Y. Round your answer to 2 significant digits.

Chemistry
10th Edition
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Chapter1: Chemical Foundations
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### Problem Statement

A freshly isolated sample of \( ^{90}\text{Y} \) was found to have an activity of \( 8.5 \times 10^5 \) disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be \( 2.3 \times 10^4 \) disintegrations per minute. Calculate the half-life of \( ^{90}\text{Y} \). Round your answer to 2 significant digits.
Transcribed Image Text:### Problem Statement A freshly isolated sample of \( ^{90}\text{Y} \) was found to have an activity of \( 8.5 \times 10^5 \) disintegrations per minute at 1:00 p.m. on December 3, 2006. At 2:15 p.m. on December 17, 2006, its activity was measured again and found to be \( 2.3 \times 10^4 \) disintegrations per minute. Calculate the half-life of \( ^{90}\text{Y} \). Round your answer to 2 significant digits.
**Radioactive Decay Series Analysis**

**Consider the decay series:**

\[ A \rightarrow B \rightarrow C \rightarrow D \]

In this series, A, B, and C are radioactive isotopes with half-lives of 4.50 seconds, 15.0 days, and 1.00 seconds, respectively. D is a nonradioactive isotope. 

**Problem Statement:**

Starting with 1.06 mole of A and none of B, C, or D, calculate the number of moles of A, B, C, and D left after 30 days. Round each of your answers to 2 significant digits.
Transcribed Image Text:**Radioactive Decay Series Analysis** **Consider the decay series:** \[ A \rightarrow B \rightarrow C \rightarrow D \] In this series, A, B, and C are radioactive isotopes with half-lives of 4.50 seconds, 15.0 days, and 1.00 seconds, respectively. D is a nonradioactive isotope. **Problem Statement:** Starting with 1.06 mole of A and none of B, C, or D, calculate the number of moles of A, B, C, and D left after 30 days. Round each of your answers to 2 significant digits.
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