Domanda del libro di testo
A cube of gold that is 1.00 cm on a side has a mass of 19.3 g. A single gold atom has a mass of 197.0 u. (b) From the information given, estimate the diameter in Å of a single gold atom.
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Ch.2 - Atoms, Molecules, and Ions
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 90b
(b) How many molecules of C13H18O2 are in this tablet?
Guida verificata passo dopo passo1
Determine the molar mass of C_{13}H_{18}O_{2} by adding the atomic masses of all atoms in the formula.
Use the given mass of the tablet to find the number of moles of C_{13}H_{18}O_{2} using the formula: \( \text{moles} = \frac{\text{mass}}{\text{molar mass}} \).
Use Avogadro's number (6.022 \(\times\) 10^{23} molecules/mol) to convert moles of C_{13}H_{18}O_{2} to molecules.
Multiply the number of moles by Avogadro's number to find the total number of molecules.
Ensure all units are consistent and cancel appropriately to verify the calculation process.
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Molecular Formula
The molecular formula of a compound indicates the number and type of atoms present in a molecule. For C13H18O2, it shows that each molecule contains 13 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms. Understanding the molecular formula is essential for calculating the number of molecules in a given mass of the substance.
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02:08
Determining Molecular Formulas
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 convert between the number of moles and the number of individual molecules, which is crucial for determining how many molecules are present in a specific quantity of a compound.
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02:11Avogadro's Law
Molar Mass
The molar mass of a compound is the mass of one mole of that substance, typically expressed in grams per mole (g/mol). For C13H18O2, calculating the molar mass involves summing the atomic masses of all atoms in the molecular formula. This value is necessary for converting grams of the substance to moles, which can then be used to find the number of molecules.
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Percorso guidato
02:11Molar Mass Concept
Pratica correlata
Domanda del libro di testo
A cube of gold that is 1.00 cm on a side has a mass of 19.3 g. A single gold atom has a mass of 197.0 u. (a) How many gold atoms are in the cube?
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Domanda del libro di testo
The diameter of a rubidium atom is 495 pm We will consider two different ways of placing the atoms on a surface. In arrangement A, all the atoms are lined up with one another to form a square grid. Arrangement B is called a close-packed arrangement because the atoms sit in the 'depressions' formed by the previous row of atoms: (a) Using arrangement A, how many Rb atoms could be placed on a square surface that is 1.0 cm on a side?
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Domanda del libro di testo
"The diameter of a rubidium atom is 495 pm We will consider two different ways of placing the atoms on a surface. In arrangement A, all the atoms are lined up with one another to form a square grid. Arrangement B is called a close-packed arrangement because the atoms sit in the 'depressions' formed by the previous row of atoms:
(c) If extended to three dimensions, which arrangement would lead to a greater density for Rb metal?"
806
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Domanda del libro di testo
"The diameter of a rubidium atom is 495 pm We will consider two different ways of placing the atoms on a surface. In arrangement A, all the atoms are lined up with one another to form a square grid. Arrangement B is called a close-packed arrangement because the atoms sit in the 'depressions' formed by the previous row of atoms:
(c) By what factor has the number of atoms on the surface increased in going to arrangement B from arrangement A?
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Domanda del libro di testo
Very small semiconductor crystals, composed of approximately
1000 to 10,000 atoms, are called quantum dots.
Quantum dots made of the semiconductor CdSe are now
being used in electronic reader and tablet displays because
they emit light efficiently and in multiple colors, depending
on dot size. The density of CdSe is 5.82 g/cm3.
(b) CdSe quantum dots that are 2.5 nm in diameter emit
blue light upon stimulation. Assuming that the dot is a
perfect sphere and that the empty space in the dot can
be neglected, calculate how many Cd atoms are in one
quantum dot of this size.
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