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
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
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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Textbook Question
(a) What is the mass, in grams, of one mole of 12C?
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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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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: 42 g of NaHCO3,1.5molCO2,6.0×1024 Ne atoms.
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What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb?
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