Со1. The radioactive nuclide Co has a half-life of 5.27 years. Calculate the mass of60276027Co thatremains from a 0.0100 g sample of the nuclide after 1.00 year has elapsed.351612. The sample of S, is a B emitter, has an activity of 0.100 uCi. In 20.0 days, the activityof the sample has declined to 0.0853 uCi. What is the half-life ofS?35163. The half-life of 9Tc, a B emitter, is 15.8 s.(a) How many atoms of Tc are present in a sample with an activity of 0.200 i ?(b) What is the mass of the sample?43100434. A sample of wooden artifact is found to undergo 9.0 C disintegrations per minute pergram of carbon. What is the approximate age of the artifact? The half-life of 1C is 5730years, and the radiocarbon activity of wood recently cut down is 15 disintegrations perminute per gram of carbon.145. Carbon-11, used in medical imaging, has a half-life of 20.4 min. The carbon-11 nuclidesare formed and the carbon atoms are then incorporated into an appropriate compound. Theresulting sample is injected into a patient and the medical image obtained. If the entireprocess takes five half-lives, what percentage of the carbon-11 remains at this time?6. A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-lifefor the decay of uranium-238 to lead-206 is 4.5 x 10° years. How old is the rock?7. If we start with 1.000 g of strontium-90, 0.953 g will remain after 2 years. (a) What is thehalf-life of strontium-90? (b) how much strontium-90 will remain after 5 years? (c) Whatis the initial activity of the sample in Bq?

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Answered: 1. The radioactive nuclide Co has a…

1. The radioactive nuclide Co has a half-life of 5.27 years. Calculate the mass of Co that remains from a 0.0100 g sample of the nuclide after 1.00 year has elapsed. 60

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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