5. The decay of iridium - 92, a radioisotope used in cancer radiation therapy, has a rate constant of 9.3 x 10 3 d. Calculate the half-life of 192Ir. (REFER TO EXAMPLE 4) 5. Iodine - 131 is used in the form of sodium iodide to treat cancer of the thyroid. The isotope has a half-life of 8.04 days. If you begin with 25.0-mg of radioactive 131I, what mass remains after 32.2 days? (CHALLENGE PROBLEM) 7. A sample of wood from a Thracian chariot found in an excavation in Bulgaria has a 14C activity of 11.2 disintegrations per minute per gram. Estimate the age of the chariot and the year it was made. (half-life for 1"C is 5.73x10° years, and the activity of 14C in living material is 15.3 disintegrations per minute per gram). (CHALLENGE PROBLEM)

5. The decay of iridium - 92, a radioisotope used in cancer radiation therapy, has a rate constant of 9.3 x 10 3 d. Calculate the half-life of 192Ir. (REFER TO EXAMPLE 4) 5. Iodine - 131 is used in the form of sodium iodide to treat cancer of the thyroid. The isotope has a half-life of 8.04 days. If you begin with 25.0-mg of radioactive 131I, what mass remains after 32.2 days? (CHALLENGE PROBLEM) 7. A sample of wood from a Thracian chariot found in an excavation in Bulgaria has a 14C activity of 11.2 disintegrations per minute per gram. Estimate the age of the chariot and the year it was made. (half-life for 1"C is 5.73x10° years, and the activity of 14C in living material is 15.3 disintegrations per minute per gram). (CHALLENGE PROBLEM)

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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