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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 12 % of the U - 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. ΕΥ ΑΣφ. 圖]? t = yr Part B If a sample of U – 238 initially contained 1.1x1018 atoms and was formed 4.6 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. 圖] N = atoms Submit Request Answer

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 12 % of the U - 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. ΕΥ ΑΣφ. 圖]? t = yr Part B If a sample of U – 238 initially contained 1.1x1018 atoms and was formed 4.6 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. 圖] N = atoms Submit Request Answer

Chemistry
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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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please answer all as they are part of 1 question but different questions,,.

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 12 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. t = yr Part B If a sample of U – 238 initially contained 1.1×1018 atoms and was formed 4.6 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. 画]? N = atoms Submit Request Answer
Transcribed Image Text: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 12 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. t = yr Part B If a sample of U – 238 initially contained 1.1×1018 atoms and was formed 4.6 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. 画]? N = atoms Submit Request Answer
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