Textbook Question
(a) Write 'true' or 'false' for each statement. (d) A mole of NaCl(s) contains 2 moles of ions
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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 3, Problem 30a
(a) What is the mass, in grams, of one mole of 12C?
Verified step by step guidance1
Understand that the mass of one mole of an element is its molar mass, which is numerically equal to the atomic mass of the element in atomic mass units (amu).
Recognize that the atomic mass of carbon-12 (\(^{12}\text{C}\)) is exactly 12 amu by definition.
Recall that one mole of any substance contains Avogadro's number of entities, which is approximately \(6.022 \times 10^{23}\) entities.
Since the atomic mass of \(^{12}\text{C}\) is 12 amu, the molar mass of \(^{12}\text{C}\) is 12 grams per mole.
Conclude that the mass of one mole of \(^{12}\text{C}\) is 12 grams.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is numerically equivalent to the atomic or molecular weight of the substance in atomic mass units (amu). For example, the molar mass of carbon-12 (12C) is 12 g/mol, meaning one mole of carbon-12 weighs 12 grams.
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Molar Mass Concept
Avogadro's Number
Avogadro's number, approximately 6.022 x 10²³, is the number of atoms, molecules, or particles in one mole of a substance. This constant allows chemists to convert between the number of particles and the amount of substance in moles, facilitating calculations in stoichiometry and chemical reactions.
Isotopes
Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. Carbon-12 is a stable isotope of carbon with 6 protons and 6 neutrons, and it is commonly used as a standard for defining the mole and molar mass in chemistry.
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Related Practice
Textbook Question
(a) Write 'true' or 'false' for each statement. (b) A mole of water has a mass of 18.0 g.
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Textbook Question
What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb? How does this compare with the mass of Earth, 5.98⨉1024 kg?
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Textbook Question
(b) How many bromine atoms are present in one mole of 12C?
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Textbook Question
Calculate the percentage of carbon by mass in each of the compounds represented by the following models: (a)
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Textbook Question
Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 0.50 mol H2O, 23 g Na, 6.0⨉1023 N2 molecules.
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