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# Solved: Bromine has two naturally occurring isotopes

## Problem 103P Chapter 4

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition

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Problem 103P

Bromine has two naturally occurring isotopes (Br-79 and Br-81) and an atomic mass of 79.904 amu.

(a) If the natural abundance of Br-79 is 50.69%, what is the natural abundance of Br-81?

(b) If the mass of Br-81 is 80.9163 amu, what is the mass of Br-79?

Step-by-Step Solution:
Step 2 of 4

Solution 103P

Here, we are going to calculate the natural abundance of Br-81 and the mass of Br-79.

Step1:

Atomic mass can be defined as the average mass of the isotopes of that element. If an element has no isotopes, then the mass of its atom would be the same as the sum of protons and neutrons in it. But if an element occurs in isotopic forms, then we have to know the percentage of each isotopic form and then the average mass is calculated.

The general formula for calculating the atomic mass of an element having n number of isotopes is given below:

Atomic mass = (fraction of isotope n) x (mass of isotope n)        ----(1)

Step 2:

Given, natural abundance of Br-79 = 50.69 %

Therefore, natural abundance of Br-81 = 100 - 50.69 = 49.31 %

Step 3 of 4

Step 4 of 4

##### ISBN: 9780321910295

This full solution covers the following key subjects: mass, natural, AMU, abundance, Isotopes. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. Since the solution to 103P from 4 chapter was answered, more than 314 students have viewed the full step-by-step answer. The answer to “Bromine has two naturally occurring isotopes (Br-79 and Br-81) and an atomic mass of 79.904 amu.(a) If the natural abundance of Br-79 is 50.69%, what is the natural abundance of Br-81?(b) If the mass of Br-81 is 80.9163 amu, what is the mass of Br-79?” is broken down into a number of easy to follow steps, and 45 words. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. The full step-by-step solution to problem: 103P from chapter: 4 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM.

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