Ch.19 - Nuclear ChemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.If a sample of U-238 initially contained 1.6×1018 atoms when the universe was formed 1

Solution: The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.If a sample of U-238 initially contained 1.6×1018 atoms when the universe was formed 1

Problem

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

If a sample of U-238 initially contained 1.6×1018 atoms when the universe was formed 13.8 billion years ago, how many U-238 atoms will it contain today?

Solution

We’re being asked to determine how many U-238 atoms will a sample of U-238 contain today if it initially contained 1.6 x 1018 atoms when the universe formed 13.8 billion years ago. 

The half-life of U-238 is 4.5 billion years.


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