Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter14: Nuclear Chemistry
Section: Chapter Questions
Problem 14.74PAE
Related questions
Question
Answer all the questions.
Transcribed Image Text:19.
Manganese-56 decays by beta emission and has a half-life of
2.6 hours. How many mg of a 20.0mg sample will remain after 13
hours?
20.
Uranium-238 has a half-life of 4.46 billion years. How long
will it take for a 12g sample to decay to 0.1875g?
Transcribed Image Text:16.
A doctor suspects that his patient may have Grave's Disease,
a thyroid disorder. To be sure he asks the technician to perform
radionuclide scanning. This procedure requires the use of iodine-
131 which, when given in small doses, is used as a medical tracer
to detect thyroid disorders. A patient swallows 10 grams of the
iodine-131. Sixteen days later, the detectors observe 2.5 grams of
iodine in the patient's thyroid. What is the half-life of iodine-131?
17. To prevent food spoilage, food can be irradiated with
gamma rays from cobalt-60. If the half-life of cobalt-60 is 5.3
years, how much of a 75g sample will remain after 1.3 years?
Scientists use carbon-14 dating to determine the age of
archeological artifacts up to 50,000 years old. Carbon-14 has al
half-life of 5730 years. A 10,000 year old fossil currently contains
1.8g of carbon-14. How many grams of carbon-14 did the fossil
originally contain?
18.
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