The half-life for the radioactive decay of U-238 is 4.5billion years and is independent of initial concentration. iew | Constants | Periodic lalPart AHow long will it take for 15% of the U-238 atoms in a sample of U-238 to decay?Express your answer in years to two significant figures.> View Available Hint(s)Πνα ΑΣφ圈]t =yrSubmitPart BIf a sample of U-238 initially contained 1.9 x 1018 atoms when the universe was formed 13.8 billion years ago, how many U-238atoms will it contain today?Express your answer in atoms to two significant figures.> View Available Hint(s)ΑΣΦ國] ?[U-238], =atoms

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How long will it take for 15% of the U-238 atoms in a sample of U-238 to decay? Express your answer in years to two significant figures. > View Available Hint(s) t = yr Submit Part B If a sample of U-238 initially contained 1.9 x 1018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms will it contain today? Express your answer in atoms to two significant figures. > View Available Hint(s) 國] ? [U-238], = atoms

How long will it take for 15% of the U-238 atoms in a sample of U-238 to decay? Express your answer in years to two significant figures. > View Available Hint(s) t = yr Submit Part B If a sample of U-238 initially contained 1.9 x 1018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms will it contain today? Express your answer in atoms to two significant figures. > View Available Hint(s) 國] ? [U-238], = atoms

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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Write the complete answers with a solution and box the final answers and explain please so I can understand it thank very much.
NUCLEAR CHEMISTRY: Consider the nuclei 117, 50 Sn. Determine its mass defect in kilograms if its atomic mass is 116.978 amu. The mass of a proton and neutron are 1.0073 and 1.0087 amu, respectively. Express your answers in three decimal places in scientific notation, i.e., 6.022e23 to represent 6.022 x 1023. Do not include the unit.