Domanda del libro di testo
The first atoms of seaborgium (Sg) were identified in 1974. The longest-lived isotope of Sg has a mass number of 266. (a) How many protons, electrons, and neutrons are in an 266Sg atom?
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Ch.2 - Atoms, Molecules, and Ions
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- 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: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 2, Problema 100e
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of molecules, and the mass of a molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of consists of three peaks: m/zRelative Peak Intensity157.836 0.2569 159.834 0.4999 161.832 0.2431
e. Calculate the abundances of the two isotopes.
Guida verificata passo dopo passo1
Determine the molecular composition of bromine: Bromine exists as diatomic molecules (Br2), so each molecule consists of two bromine atoms.
Identify the isotopes: The mass spectrum peaks correspond to different combinations of the two isotopes of bromine. The peaks at m/z 157.836, 159.834, and 161.832 suggest the presence of two isotopes, Br-79 and Br-81.
Assign the peaks to isotopic combinations: The peak at m/z 157.836 corresponds to Br-79/Br-79, the peak at m/z 159.834 corresponds to Br-79/Br-81 or Br-81/Br-79, and the peak at m/z 161.832 corresponds to Br-81/Br-81.
Use the relative peak intensities to set up equations: Let x be the abundance of Br-79 and y be the abundance of Br-81. The relative intensities give us the equations: x^2 = 0.2569, 2xy = 0.4999, and y^2 = 0.2431.
Solve the system of equations: Use the equations to solve for x and y, which represent the fractional abundances of Br-79 and Br-81, respectively.
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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. For bromine, the two stable isotopes are bromine-79 and bromine-81. Understanding isotopes is crucial for analyzing mass spectra, as the relative abundance of each isotope affects the overall mass of the elemental sample.
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04:36
Isotopes
Mass Spectrum
A mass spectrum is a graphical representation of the mass-to-charge ratio (m/z) of ions, which helps identify the composition of a sample. Each peak in the spectrum corresponds to a specific ion, with its height indicating the relative abundance of that ion. In the case of bromine, the peaks represent the isotopes and their respective abundances, which can be calculated from the peak intensities.
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Percorso guidato
02:53Electromagnetic Spectrum
Relative Abundance Calculation
Relative abundance refers to the proportion of each isotope present in a sample compared to the total amount of isotopes. To calculate the abundances of bromine isotopes from the mass spectrum, one can use the peak intensities to determine the ratio of each isotope's contribution to the total intensity. This involves setting up equations based on the peak heights and solving for the unknown abundances.
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5:41Calculating Abundance Example
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Domanda del libro di testo
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of molecules, and the mass of a molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of consists of three peaks: m/zRelative Peak Intensity157.836 0.2569 159.834 0.4999 161.832 0.2431
b. What is the mass of each isotope?
2
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Domanda del libro di testo
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of molecules, and the mass of a molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of consists of three peaks: m/zRelative Peak Intensity157.836 0.2569 159.834 0.4999 161.832 0.2431
d. Determine the average atomic mass of a bromine atom.
2
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Domanda del libro di testo
From the following list of elements—Ar, H, Ga, Al, Ca, Br, Ge, K, O—pick the one that best fits each description. Use each element only once: (a) an alkali metal, (b) an alkaline earth metal, (c) a noble gas, (d) a halogen, (e) a metalloid, (f) a nonmetal listed in group 1A, (g) a metal that forms a 3+ ion, (h) a nonmetal that forms a 2- ion, (i) an element that resembles aluminum.
2
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Domanda del libro di testo
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of molecules, and the mass of a molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of consists of three peaks: m/zRelative Peak Intensity157.836 0.2569 159.834 0.4999 161.832 0.2431
c. Determine the average molecular mass of a molecule.
2
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Domanda del libro di testo
It is common in mass spectrometry to assume that the mass of a cation is the same as that of its parent atom. (b) What percentage of the mass of an 1H atom does the electron represent?
305
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