Domanda del libro di testo
Silver is composed of two naturally occurring isotopes: Ag-107 (51.839%) and Ag-109. The ratio of the masses of the two isotopes is 1.0187. What is the mass of Ag-107?
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Ch.2 - Atoms & Elements
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving136
- Ch.2 - Atoms & Elements112
- Ch.3 - Molecules, Compounds & Chemical Equations159
- Ch.4 - Chemical Quantities & Aqueous Reactions140
- Ch.5 - Gases118
- Ch.6 - Thermochemistry106
- Ch.7 - Quantum-Mechanical Model of the Atom62
- Ch.8 - Periodic Properties of the Elements103
- Ch.9 - Chemical Bonding I: The Lewis Model104
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory89
- Ch.11 - Liquids, Solids & Intermolecular Forces73
- Ch.12 - Solids and Modern Material59
- Ch.13 - Solutions110
- Ch.14 - Chemical Kinetics140
- Ch.15 - Chemical Equilibrium78
- Ch.16 - Acids and Bases155
- Ch.17 - Aqueous Ionic Equilibrium176
- Ch.18 - Free Energy and Thermodynamics108
- Ch.19 - Electrochemistry118
- Ch.20 - Radioactivity and Nuclear Chemistry82
- Ch.21 - Organic Chemistry150
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 123
Pure gold is usually too soft for jewelry, so it is often alloyed with other metals. How many gold atoms are in an 0.255-ounce, 18 K gold bracelet? (18 K gold is 75% gold by mass.)
Guida verificata passo dopo passo1
Convert the mass of the bracelet from ounces to grams using the conversion factor: 1 ounce = 28.3495 grams.
Calculate the mass of gold in the bracelet by multiplying the total mass of the bracelet by the percentage of gold (75%).
Convert the mass of gold from grams to moles using the molar mass of gold (Au), which is approximately 197 g/mol.
Use Avogadro's number (6.022 x 10^23 atoms/mol) to convert the moles of gold to the number of gold atoms.
Compile the steps to ensure the logical flow from mass conversion to determining the number of atoms.
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Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). For gold (Au), the molar mass is approximately 197 g/mol. Understanding molar mass is essential for converting between grams and moles, which is necessary for calculating the number of atoms in a given mass of gold.
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Percorso guidato
02:11
Molar Mass Concept
Alloy Composition
An alloy is a mixture of two or more elements, where at least one is a metal. In the case of 18 K gold, it contains 75% gold by mass and 25% other metals. This composition affects the properties of the material, such as hardness and color, and is crucial for determining the actual mass of gold in the bracelet.
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Percorso guidato
04:19Matter Composition
Avogadro's Number
Avogadro's number, approximately 6.022 x 10^23, is the number of atoms, ions, or molecules in one mole of a substance. This constant allows chemists to relate the mass of a substance to the number of particles it contains. In this problem, it is used to convert the number of moles of gold into the actual number of gold atoms present in the bracelet.
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Percorso guidato
02:11Avogadro's Law
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The U.S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants. The maximum level that the EPA considers safe for lead air pollution is 1.5 µg/m3. If your lungs were filled with air containing this level of lead, how many lead atoms would be in your lungs? (Assume a total lung volume of 5.50 L.)
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Domanda del libro di testo
Let a triangle represent atoms of element A and a circle represent atoms of element B. b. Draw an atomic view of the compound AB in a liquid state (molecules close together).
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A volatile liquid (one that easily evaporates) is put into a jar and the jar is then sealed. Does the mass of the sealed jar and its contents change upon the vaporization of the liquid?
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Domanda del libro di testo
Naturally occurring chlorine is composed of two isotopes: 75.76% Cl-35 (mass 34.9688 amu) and 24.24% Cl-37 (mass 36.9659 amu). Naturally occurring oxygen is composed of three isotopes: 99.757% O-16 (mass 15.9949 amu), 0.038% O-17 (mass 16.9991 amu), and 0.205% O-18 (mass 17.9991 amu). The compound dichlorine monoxide is composed of two chlorine atoms and one oxygen atom bonded together to form the Cl2O molecule. How many Cl2O molecules of different masses naturally exist? Give the masses of the three most abundant Cl2O molecules.
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