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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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 Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 3, Problem 30b
(b) How many bromine atoms are present in one mole of 12C?
Verified step by step guidance1
Understand the concept of a mole: A mole is a unit in chemistry that represents \$6.022 \times 10^{23}$ entities (Avogadro's number).
Identify the substance in question: The problem asks about bromine atoms in one mole of \(^{12}\text{C}\), which is carbon-12.
Recognize that carbon-12 does not contain bromine atoms: Carbon-12 is a pure element consisting only of carbon atoms.
Conclude that since carbon-12 does not contain bromine, there are zero bromine atoms in one mole of \(^{12}\text{C}\).
Reaffirm the understanding that the question is testing knowledge of chemical composition and the definition of a mole.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Mole Concept
The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole of any substance contains Avogadro's number of entities, which is approximately 6.022 x 10²³. This concept allows chemists to convert between the mass of a substance and the number of atoms, molecules, or ions it contains.
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Mole Concept
Atomic Composition
Atomic composition refers to the types and numbers of atoms that make up a molecule or compound. In the case of bromine, it is a diatomic molecule (Br₂) in its elemental form, meaning each molecule consists of two bromine atoms. Understanding atomic composition is crucial for determining the number of atoms in a given quantity of a substance.
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Chemical Symbols and Formulas
Chemical symbols and formulas are shorthand representations of elements and compounds. For example, 'Br' represents a bromine atom, while 'Br₂' indicates a molecule of bromine containing two bromine atoms. Recognizing these symbols is essential for interpreting chemical equations and understanding the relationships between different substances.
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Related Practice
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(a) Write 'true' or 'false' for each statement. (d) A mole of NaCl(s) contains 2 moles of ions
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Textbook Question
(a) What is the mass, in grams, of one mole of 12C?
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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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