Ch.2 - Atoms & ElementsWorksheetSee 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 element bromine has an atomic weight of 79.9 and consists of two stable isotopes bromine-79 and bromine-81. The isotope bromine-79 has a mass of 78.9 amu and a percent natural abundance of 50.5%. 

Solution: The element bromine has an atomic weight of 79.9 and consists of two stable isotopes bromine-79 and bromine-81. The isotope bromine-79 has a mass of 78.9 amu and a percent natural abundance of 50.5%. 

Problem

The element bromine has an atomic weight of 79.9 and consists of two stable isotopes bromine-79 and bromine-81. 

The isotope bromine-79 has a mass of 78.9 amu and a percent natural abundance of 50.5%. 

The isotope bromine-81 has a percent natural abundance of 49.5%. 

What is the mass of bromine-81 in amu units?