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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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The half-life of the radioactive element
unobtanium-37 is 5 seconds. If 32 grams of unobtanium-37 are initially present, how many grams are present after
5 seconds? 10 seconds? 15 seconds? 20 seconds? 25 seconds?
The amount left after 5 seconds is ? grams.
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- The isotope strontium-90 is produced during testing of nuclear weapons. If 100.0 mg of strontium-90 was released in the atmosphere in 1960, how much of the radioisotope remains 87.00 years later? The half-life of strontium-90 is 29.00 years.arrow_forwardSodium24, which is used to locate blood clots in the human circulatory system, has a halflife of 15.0 h. A sample of sodium-24 with an inital mass of 21.5 g was stored for 60.0 h. How many grams of sodium- 24 are left in the sample after 60.0 h?arrow_forward[Review Topics] [References] Use the References to access important values if needed for this question. The radioactive isotope carbon-14 is used for radiocarbon dating. The half-life of carbon-14 is 5.730 x 10° years. A wooden artifact in a museum has a C count that is 1.56 x 10 times that found in living organisms. Estimate the age of the artifact. Age = years Submit Answer Retry Entire Group 1 more group attempt remainingarrow_forward
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- 3. The half-life of protactinium-234 is 6.69 hours. What fraction of a given amount remains after 26.76 hours?arrow_forwardPhosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in studies of nucleic acids. The half-life of phosphorus-32 is 14.3 days. What mass of phosphorus-32, in milligrams, is left from an original sample of 175 mg of Na 32PO, after 31.1 days? Assume that the atomic mass of 32P is 32.0.arrow_forwardPlutonium-238 is used in spacecraft to provide heat to power generators. One of thesegenerators contained 765 g of plutonium-238 when it was manufactured. Given that thehalf-life of plutonium-238 is 87.7 years, calculate the mass of plutonium-238 remainingafter 350.0 years.arrow_forward
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