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• Part A The half-life for the radioactive decay of U - 238 is 4.5 billion years and is independent initial concentration. How long will it take for 16 % of the U - 238 atoms in a sample ofU - 238 to decay? Express your answer using two significant figures. t= 1.1x109 yr Previous Answers v Correct Correct answer shown. Your answer 11.323-10 = 1.132x10° yr was either rounded differently or used a different number of significant figures than required for this par • Part B If a sample of U– 238 initially contained 1.3x1018 atoms and was formed 6.1 billion years ago, how many U - 238 atoms does it contain today? Express your answer using two significant figures. Temp@es Symbols uado redo reses keyboard shortcuts help N = atoms

• Part A The half-life for the radioactive decay of U - 238 is 4.5 billion years and is independent initial concentration. How long will it take for 16 % of the U - 238 atoms in a sample ofU - 238 to decay? Express your answer using two significant figures. t= 1.1x109 yr Previous Answers v Correct Correct answer shown. Your answer 11.323-10 = 1.132x10° yr was either rounded differently or used a different number of significant figures than required for this par • Part B If a sample of U– 238 initially contained 1.3x1018 atoms and was formed 6.1 billion years ago, how many U - 238 atoms does it contain today? Express your answer using two significant figures. Temp@es Symbols uado redo reses keyboard shortcuts help N = atoms

Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter12: Kinetics
Section: Chapter Questions
Problem 46E: Fluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a...
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I need help for part B

Constants I Periodic Table Part A The half-life for the radioactive decay of U – 238 is 4.5 billion years and is independent of initial concentration. How long will it take for 16 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. t = 1.1x10° yr Submit Previous Answers Correct Correct answer is shown. Your answer 11.323-108 = 1.132x10° yr was either rounded differently or used a different number of significant figures than required for this part. Part B If a sample of U – 238 initially contained 1.3x10 18 atoms and was formed 6.1 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. Templates Symbols undo redo reset keyboard shortcuts help N = atoms
Transcribed Image Text:Constants I Periodic Table Part A The half-life for the radioactive decay of U – 238 is 4.5 billion years and is independent of initial concentration. How long will it take for 16 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. t = 1.1x10° yr Submit Previous Answers Correct Correct answer is shown. Your answer 11.323-108 = 1.132x10° yr was either rounded differently or used a different number of significant figures than required for this part. Part B If a sample of U – 238 initially contained 1.3x10 18 atoms and was formed 6.1 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. Templates Symbols undo redo reset keyboard shortcuts help N = atoms
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