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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 2.3, Problem 2RC
Textbook Problem
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A naturally occurring sample of argon contains 2696 atoms of 36Ar, 504 atoms of 38Ar, and 7.968 × 105 atoms of40Ar. What is the percent abundance of the most abundant isotope?

  1. (a) 99.60%
  2. (b) 95.08%
  3. (c) 7135%
  4. (d) 99.92%

Interpretation Introduction

Interpretation: the percent abundance of most abundant isotope of Argon is to be identified from the given options.

Concept introduction:

The percent abundance of each isotope of an atom is the ratio of number of atoms of the particular isotope to the total number of atoms and multiplied with 100.

Explanation of Solution

Reason for correct answer:

The numbers of atoms contained by each of the three isotopes of argon is given as follows, 2696 ( 36Ar ), 504 ( 38Ar ) and 7.968×105 ( 40Ar ).

Therefore,

The total number of argon present in nature is,

2696+504+7.968×105=799996

The most abundant isotope of argon is containing 7.968×105 atoms out of total number of atoms 799996

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Chemistry & Chemical Reactivity
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