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Explain the difference between Z (the atomic number) and A (the mass number)

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 15 Chapter 2

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 15

Explain the difference between Z (the atomic number) and A (the mass number).

Step-by-Step Solution:
Step 1 of 3

Chapter 3: Stoichiometry of Formulas and Equations The Mole In a chemical reaction, MANY particles participate. Mole (mol) – amount of substance that contains the same number of “entities” as there are atoms in exactly 12 grams of carbon-12. 1 mole = 6.022 * 10 entities (Avogadro’s Number(N )) A “Mole” is “entities” as “adjective” is to “noun” 12 g carbon-12 = 6.022 * 10 carbon-12 atoms 12 g carbon-12 = 1 mole carbon-12 atoms Note: 12 amu carbon-12 = 1 carbon-12 atom Molar Mass (MM) – the mass of a substance that contains 1 mole of its “entities”, in units of g/mol (grams per mole) Molar mass is numerically equivalent to a substance’s atomic, molecular, or formula mass (in amu).

Step 2 of 3

Chapter 2, Problem 15 is Solved
Step 3 of 3

Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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Explain the difference between Z (the atomic number) and A (the mass number)