Chemistry 2012 Student Edition (hard Cover) Grade 11
Chemistry 2012 Student Edition (hard Cover) Grade 11
12th Edition
ISBN: 9780132525763
Author: Prentice Hall
Publisher: Prentice Hall
Question
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Chapter 4, Problem 53A
Interpretation Introduction

Interpretation : The atomic mass of lithium is to be calculated.

Concept Introduction : Atomic mass is the weighted average mass of the atoms in a sample of an element that is present in nature.

Expert Solution & Answer
Check Mark

Answer to Problem 53A

The atomic mass of lithium is 6.9409amu .

Explanation of Solution

Given information:

The relative abundance of lithium of atomic mass 6.015 amu is 7.5% .

The relative abundance of lithium of atomic mass 7.016 amu is 92.5% .

Atomic mass is the weighted average mass of the atoms in a sample of an element that is present in nature.

For the calculation of atomic mass, multiply each isotope's mass by its natural abundance, represented as a decimal, and add on the products.

The relative abundance of lithium of atomic mass 6.015 amu is given as

  7.5%=7.5100=0.075

The relative abundance of lithium of atomic mass 7.016 amu is given as

  92.5%=92.5100=0.925

Calculate the atomic mass of lithiumas follows:

  atomicmass=6.015 amu×0.075amu+7.016 amu×0.925amu=0.4511amu+6.4898amu=6.9409amu

Thus, the atomic mass of lithium is 6.9409amu .

Chapter 4 Solutions

Chemistry 2012 Student Edition (hard Cover) Grade 11

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