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Rutherfordium-261 has a half life of 81 seconds. How much time has passed if 12.5 %...
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 =...
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
Question 6 4 pts Seaborgium-266 has a half-life of 30 seconds. A sample contains 611 mg of the isotope. How much of the isotope remains after 90 seconds?
A certain reaction has a fixed half-life of 125 sec, how much time does it take for 25.0% of the original reactant to be reacted?
Carbon-14 has a half-life of 5,700 years. Suppose a sample of wood now has 12.5% as much Carbon-14 as it had when it formed. How old is the sample?
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 X ?
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 0.0 X ?
A 1.00g sample of nobelium, 254No, has a half-life of 55 seconds after it is formed. What is the percentage of 254No remaining 5 minutes after it forms. 0.0228 % 254No remains 0.438 % 254No remains 2.28 % 254No remains 4.38 % 254No remains
A First-Order reaction has a half-time(half-life) of 25 seconds. The approximate time required for the reaction to be 75% complete is A) 50s B)37.5s C)100s D)75s E)none of these
The half-life of 52Mn is 5.59 days. (a) Convert the half-life to units of seconds. (b) What is the decay constant (in s−1) for this isotope? (c) Suppose a sample of 52Mn has an activity of 0.510 µCi. What is this activity expressed in the SI unit of becquerels (Bq)? (d) How many 52Mn nuclei are needed in the sample in part (c) to have the activity of 0.510 µCi? E. Now suppose that a new sample of 52Mn has...