A rock contains 0.313 mg Pb-206 for every 1.000 mg of U-238. Assuming that the rock contained no lead initially, calculate the age of the rock. The half-life for U-238 is 4.5 x 10 years. (Hint: you will need the percent of each isotope in the sample) Enter your answer using scientific notation entered using the E format. (For example, 6.022E23 represents 6.022 x 1023). type your answer... years

A rock contains 0.313 mg Pb-206 for every 1.000 mg of U-238. Assuming that the rock contained no lead initially, calculate the age of the rock. The half-life for U-238 is 4.5 x 10 years. (Hint: you will need the percent of each isotope in the sample) Enter your answer using scientific notation entered using the E format. (For example, 6.022E23 represents 6.022 x 1023). type your answer... years

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of Pb206 in the rock, if it currently contains 1.430 g of U238? The half-life of U238 is 4.47×109 years.
Radioactive decay can be described by the following equation In A = In Ao – kt where Ao is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. -1 For the radioactive isotope lead-210, k is 3.30 x 10 years If the original amount of lead-210 in a sample is 60.0 mg, how much lead-210 remains after 24.6 years have passed? mg
Krypton-81m is used for lung ventilation studies. Its half-life is 13 ss. How long does it take the activity of this isotope to reach one-quarter of its original value?
The half-life of radioactive strontium-90 is 28.8 years. How long would it take when only 16.5% of the original strontium-90 sample remains?
Radioactive vanadium-48 decays with a half-life of 16.0 days. a. What is the value of k in s? k = b. A sample contains 84.0 mg *°V. How many decay events will be produced in the first second? Assume the atomic mass of **V is 48.0 u. decays/s c. A chemist obtains a fresh sample of 48 V and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. How long does she have to do the experiment? days
187Pb has a half-life of 15.2 s. If a sample of this isotope is initially 750.0 g, what mass of the isotope (in g) will remain after 18.5 s?
The currently accepted value for the half-life of radiocarbon is 5,730 years. Based on that information, which of the following conclusions is correct. 1. In 2,865 years, the entire original amount of carbon-14 in the sample will be gone. 2. In 11,460 years, the entire sample will be another element. 3. In 5,730 years, half of the original sample of carbon will be gone. 4. In 5,730 years, half of the original amount of carbon-14 in the sample will be gone.
Americium-241 is widely used in smoke detectors. The radiation released by this element ionizes particles that are then detected by a charged-particle collector. The half-life of 241Am is 432 years, and 241 Am? it decays by emitting alpha particles. How many alpha particles are emitted each second by a 4.74-g sample of particles
The half life for the decay of carbon-14 is 5.73 × 10³ years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 17. Bq. The activity in a similar-sized sample of fresh wood is measured to be 18. Bq. Calculate the age of the artifact. Round your answer to 2 significant digits. years x10 X
A radioactive sample has a decay constant of 1.32 x 10-3 h-1. What is its half life?
The half-life of Strontium-85 is 65 days. How much of a 80. mg sample is left after 260 days? mg
lodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days. A sample contained 2.00 kg lodine-125 when it was made. How old is the sample when it contains 0.0625 kg Iodine- 125 (in days)?