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Solved: Carbon-14, present within living organisms and substances derived from living

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 99P Chapter 4

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 99P

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 1 of 3

Solution 99P

Here, we are going to calculate the number of protons and neutrons in Carbon-14

When atoms have same atomic number but different mass number are called isotopes. Isotopes can be symbolized by using the following notation.Where, X is the chemical symbol

A is the mass number = Number of protons + number of neutrons

Z is the atomic number = Number of protons present in the nucleus of that atom.

Carbon-14 is one of the isotope of Carbon

Carbon has atomic number Z = 6

Thus, number of protons of Carbon atom = 6

The mass number of carbon C-14 = 14

Therefore,

Mass number of an atom (A)  = Number of protons present in the nucleus (Z) + number of neutrons present in the same nucleus.

                                                        = 14-6 = 8

Therefore,

Carbon-14 has 6 protons and 8 neutrons in its nucleus.

The symbol for Carbon-14 is given below

Step 2 of 3

Chapter 4, Problem 99P is Solved
Step 3 of 3

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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Solved: Carbon-14, present within living organisms and substances derived from living