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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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What is the half-life of a sample if after 40 years 12.5g of an original 0.4kg sample is left?
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- 42 The half-life of 1K is 12.5 hrs. How much will remain after 65 hrs if the original 19- sample contained 256 g of K? 19 7.0 g 11 g 20 g 24 g 17 garrow_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 Na₃³²PO₄ after 41.5 days? Assume that the atomic mass of ³²P is 32.0arrow_forwardHow long will it take for the intial amount of U-235 to be reduced of this initial amountarrow_forward
- A certain drug has a half-life in the body of 7.5 h. What should the interval between doses be, if the concentration of drug in the body should not fall below 25.% of its initial concentration? Round your answer to 2 significant digits.arrow_forwardThe first-order decay of iron-59 has a half-life of 44,495 days. How many grams of iron-59 decompose after one month (assume it is in April) if the sample initially weighs 100.0 g?arrow_forward49. The half life of C0-60 is 5.2 years. How many mg of a 1000 mg sample will remain after 9.50 years? 0.1332 mg 0 mg 0.693 mg 0.283 mgarrow_forward
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