Chapter 2, Problem 21PS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# Verify that the atomic weight of lithium is 6.94, given the following information:6Li, mass = 6.015121 u; percent abundance = 7.50%7Li, mass = 7.016003 u; percent abundance = 92.50%

Interpretation Introduction

Interpretation:

The atomic weight 6.94 of lithium has to be checked if the one isotope (6Li ) has a mass of 6.015121u in an abundance 7.50% and other isotope (7Li) has a mass of 7.016003u in an abundance of 92.50%.

Concept Introduction:

Equation for atomic weight is,

average weight=(%abundanceisotop-1100)×(massofisotop-1) +(%abundanceisotop-2100)×(massofisotop-2)+etc

Explanation

There are two isotopes for lithium atom.

The mass of isotope-1 (6Li) is 6.015121u and its abundance is 7.50%

The mass of isotope-2 (7Li) is 7.016003u and its abundance is 92.50%

Equation for atomic weight is,

Â Â Â Â atomicÂ weightâ€‰â€‰=â€‰â€‰(%abundanceâ€‰isotop-1100)â€‰â€‰Ã—â€‰(massâ€‰ofâ€‰isotop-1)â€‰ +â€‰(%abundanceâ€‰isotop-2

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