Chemistry: P x C Suppose A Patient is Given x Pt Dynamic Periodic Table x Mast a

Question

Chemistry: P x C Suppose A Patient is Given x Pt Dynamic Periodic Table x Mast a Search maste 63764818 Most Visited Getting started La Sierra Chemistr... Sa Amazon.com: Onli... YouTube 3 Google Maps 3 Apple Y Yahoo! C News Popular 3 wikipedia General Chemistry ill (CHEM 3), Spring 2016 Signed in as Delilah DeBellis Help Close Resources Post Lecture Homework Chapter 2 For Practice 21.6 previous l 20 of 23 l next For Practice 21.6 Part A A rock contains a Pb-206 to U-238 mass ratio of Assuming that the rock did not contain any Pb-206 at the time of its formation, determine its age. 0.132 1.00. AE 10 3.16 10 yr Submit My Answers Give U incorrect; Try Again; 5 attempts remaining Provide Feedback Continue

Explanation / Answer

t1/2   = 4.5*109 years

K = 0.693/t1/2

      = 0.693/4.5*109    = 1.54*10-10 years-1

0.132 g Pb 206 * (1mol Pb 206 / 207.2g Pb) * (1 mol U 238 / 1 mol Pb 206) * (238.02891g U / 1 mol U) = 0.1516 g U-238

total mass = 1+0.1516= 1.1516g

ln(fianl/initial) = -Kt

ln(1/1.1516) = -t*1.54*10-10

-7.3238 = -t*1.54*10-10    = t = 4.75*1010 year

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