Explanation The molar mass of Cl is 35.5 g / mol . The molar mass of 35 Cl is 35 g / mol . The molar mass of 37 Cl is 37 g / mol . The molar mass of the chlorine atom in the periodic table is stated as the average mass of its two isotopes (weighed in accordance to their abundance). Formula The average mass of the chlorine atom is calculated using the formula, M ( Cl ) = [ ( M ( 35 Cl ) ) × ( % abundance ( 35 Cl ) ) + ( M ( 37 Cl ) ) × ( 1 − % abundance ( 35 Cl ) ) ] Where, M ( Cl ) is the molar mass of chlorine. M ( 35 Cl ) is the molar mass of 35 Cl . M ( 37 Cl ) is the molar mass of 37 Cl . % abundance ( 35 Cl ) is the percent abundance of 35 Cl . Substitute the values of M ( Cl ) , M ( 35 Cl ) , M ( 37 Cl ) and % abundance ( 35 Cl ) in the above expression. 35

Bundle: Chemistry: An Atoms First Approach, 2nd, Loose-Leaf + OWLv2, 4 terms (24 months) Printed Access Card

2nd Edition

ISBN: 9781305717633

Author: Steven S. Zumdahl, Susan A. Zumdahl

Publisher: Cengage Learning

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Chapter 5, Problem 13ALQ

Interpretation Introduction

Interpretation: The more abundant isotope of chlorine, between 37Cl and 35Cl , is to be stated.

Concept introduction: A different form of the same element having the same proton number but a different neutron number in its nucleus is known as an isotope of the element.

To determine: The more abundant isotope of chlorine.

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