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. For the radioactive isotope strontium-80, k is 4.08 × 10-1 hours If the original amount of strontium-80 in a sample is 32.5 mg, how much time is needed for the amount of strontium-80 that remains to fall to 23.9 mg? hours

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. For the radioactive isotope strontium-80, k is 4.08 × 10-1 hours If the original amount of strontium-80 in a sample is 32.5 mg, how much time is needed for the amount of strontium-80 that remains to fall to 23.9 mg? hours

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

^3H decays to ^3He (Helium) with a half life of 12.32 years. If you start off with 1,000,000 atoms of ^3H how many years will it take for the number of ^3H atoms to reach 125,000?
A radioactive isotope, X-90, has a half-life of 82.6 years. How many years (y) will it take for 34 % to decay from the original activity? Express your answer to 3 significant figures and include the unit in your answer.
The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 x 10" years. o10 Suppose nuclear chemical analysis shows that there is 0.515 mmol of strontium-87 for every 1.000 mmol of rubidium-87 in a certain sample of rock. Calculate the age of the rock, Round your answer to 2 significant digits. years 回因
The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10¹⁰ years. Suppose nuclear chemical analysis shows that there is 0.423 mmol of strontium-87 for every 1.000 mmol of rubidium-87 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years x10
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. For the radioactive isotope radon-222, k is 1.81 × 10-1 days. If the original amount of radon-222 in a sample is 69.9 mg, how much time is needed for the amount of radon- 222 that remains to fall to 37.8 mg? days
[References] Use the References to access important values if needed for this question. Radioactive decay can be described by the following equation In A = In Ag - kt where Ag 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. For the radioactive isotope chromium-51, k is 2.50 x 10-2 days . If the original amount of chromium-51 in a sample is 29.2 mg, how much chromium-51 remains after 30.5 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain
An archaeologist finds some ancient jewelry made from bone. The jewelry has a carbon mass of 484 g (HINT: Assume all the carbon is 12C and determine the number of atoms, 12C has a molar mass of 12 g/mol) and careful measurements show that the remaining 14c has a current decay rate of 11 decays/s. Determine the age of the bone (and presumably the jewelry). The ratio of 14C to 12c when the animal died was 1.25x10-12 & the half-life of 14c is 5730 y. Additionally, 1 mol = 6.022x1023 365.25 days, & 1 day = 24 h. particles, 1 y = age of bone =
The half‑lives of different medical radioisotopes are given in the table. If the initial amount of chromium‑51 is 133 mCi, how much chromium‑51 is left in the body after 84 days? Radioisotope Half‑life (days) arsenic‑74 18 iodine‑131 8 phosphorus‑32 14 chromium‑51 28
In order to solve for the rate constant, k, in two steps you must: Step One Add the same expression to each side of the equation to leave the term that includes the variable by itself on the right- hand side of the expression: (Be sure that the answer field changes from light yellow to dark yellow before releasing your answer.) +[A] - kt + [A], Drag and drop your selection from the following list to complete the answer: 1 1 [A.] -[Ao] - [A.] [Ao] Submit
A rock contains the radioactive isotope K − 40 that decays with a half-life of 1.3 billion years and the radioactive isotope Rb− 87 that decays with a half-life of 48.6 billion years. The rock is100 million years old. The rock currently has 1000 times as many Rb− 87 atoms as there are K − 40 atoms. (That is, N Rb= 1000 × N K) When the rock first formed it had M times as many Rb − 87 atoms as L − 40 atoms. (That is, N Rb, 0 = M × N K,0.) What is the value of M?