Can someone please help with question 3

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...
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Can someone please help with question 3

Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics
and a half-life of 4.5 billion years. A rock is found to contain 84.1% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock
contained when it was formed can be deduced from the presence of the decay products of U – 238.)
Part A
How old is the rock?
Express your answer using two significant figures.
?
t =
yr
Submit
Request Answer
Transcribed Image Text:Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 84.1% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U – 238.) Part A How old is the rock? Express your answer using two significant figures. ? t = yr Submit Request Answer
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