A 701.0-nanogram (ng) sample of sodium-24 was stored in a lead-lined cabinet for 3.117 days (d). How much sodium-24 remains? The half-life of sodium-24 is 14.96 hours. Round your answer to 4 significant figures.

A 701.0-nanogram (ng) sample of sodium-24 was stored in a lead-lined cabinet for 3.117 days (d). How much sodium-24 remains? The half-life of sodium-24 is 14.96 hours. Round your answer to 4 significant figures.

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter25: Nuclear Chemistry

Section: Chapter Questions

Problem 39PS

See similar textbooks

Similar questions

18. lodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland. If a patient drinks a sodium iodide (Nal) solution containing iodine-131 on a Tuesday, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration (means Nt =5 and No = 100)? a) 19 days days c) 35 days 4.3 days b) 0.81 d)
A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 50.0 mg pill at 7:00PM and another identical pill 90 min later. Calculate the amount of drug left in his body at 9:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. mg x10 國 dlo Ar
A certain chemotherapy drug C with a molar mass of 275. g/mol is administered intravenously, and has a half-life in the body of 40. min. The maximum safe concentration of C is 400. μM. Suppose a patient has a mass of 90.0 kg and a total blood volume of 4.50 L. Calculate the maximum rate at which the drug can be given to this patient. Be sure your answer has 2 significant digits. min
Sodium24, 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?
An engineering student purchased piece of amber from a local shopping mall. The amber contained the remains of an beetle. Curious to know whether the gem is genuine or not, the student takes the sample to the laboratory and determines the concentration of Carbon-14 (λ = 5730 years). After extracting a piece of the trapped beetle with a fine drill, instrument analysis reported that the concentration of Carbon-14 is now only 94%. If there was 100% Carbon-14 when the beetle was trapped, how old is the gem and is it genuine?
A certain drug has a half-life in the body of 2.5 h. Suppose a patient takes one 200. mg pill at 6:00PM and another identical pill 90 min later. Calculate the amount of drug left in his body at 9:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits. mg x10 X
A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 200. mg pill at 7:00PM and another identical pill 90min later. Calculate the amount of drug left in his body at 11:00 PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Cesium-137 is radioactive and has a half life of 30. years. How much of a 8.10 mg sample would be left after 12.9 years? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 x10 X μ
The radioactive potassium-40 isotope decays to argon-40 with a half-life of 1.2 × 10⁹ years. (a) Write a balanced equation for the reaction. (b) A sample of moon rock is found to contain 21 percent potassium-40 and 79 percent argon by mass. Calculate the age of rock in years. (Assume that all the argon in the sample is the result of potassium decay.) x 10 years Enter your answer in scientific notation.
14. Using a mass spectrometer, a sample of an ancient wooden object was found to have a ratio of 14C to 12C equal to 3.3×10 −13 as compared to a current biological sample, which has a ratio of 14C to ¹2C of 1.2×10 −12 (Given: t, is 5730 years) What is the age of the object? 15. For the reaction, 2 A(g) + B₂(g) → 2 AB(g) The rate law is; rate = k[A][B₂]³ At 22.0 °C, k = 1234 M-³s-¹. What would be the rate of the reaction if the concentration of A is 0.100 M and concentration of B₂ is 0.125 M.
A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 100. mg pill at 7:00PM and another identical pill 90 min later. Calculate the amount of drug left in his body at 11:00PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Show complete solution.