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Question 6 4 pts Seaborgium-266 has a half-life of 30 seconds. A sample contains 611 mg...
1.Seaborgium-266 (Sg-266) has a half-life of 30 seconds. If you have 54 grams of Sg-266 at time zero, how much material with exist two minutes later? 2. What is the pH of an [H3O+] of 1.7 x 10-5 M solution
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
8. Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone? 9. 100.0 grams of an isotope with a half-life of 36.0 hours is present initially. How ma time will have elapsed when 5.00 grams remains? 131 (half-life = 8.040 days) to decay to 10. How long will it take for a 40.0 gram sample of 1-131 (half-life =...
The radioactive isotope Cs-137 has a half-life of 30 years. Starting with 1.0 mg of Cs, how much would remain after 90 years?
Fluorine-20 has a half-life of 11.0 s. If a sample initially contains 36.0 μg of this isotope, how much remains after 44.0 s ? Express your answer in micrograms to three significant figures.
V Question 5 3.03 pts Suppose a radioactive isotope has a half-life t% = 99.1 hr. How long will it take for a sample of the isotope to decay to 3.0% of its original activity? a. 218 hr b. 0.0354hr c. 348 yr d. 297 hr e. 501 hr O a Ob Ос Question 6 3.03 pts A radioactive isotope has a half-life, t% = 27.3 yr How long will it take for a 3.27 mCi sample of this isotope...
Strontium-90 has a half-life of 28.1 years. Starting with 3.2 mg of this isotope, how much would remain after 112.4 years?
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
1 pts Question 34 Helium-6 has a half-life of 1 second. How much Helium-6 would be left after 3 seconds from an original sample of 100 grams Helium-6? o 25 grams O 12.5 grams O 50 grams 75 grams Submit Qu Not saved
Radioactive gold-198 is used in the diagnosis of liver problems. The half-life of this isotope is 2.7 days. If you begin with a sample of 9.4 mg of the isotope, how much of this sample remains after 2.4 days?