### Problem StatementA 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.

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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.

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

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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