Open Question
How would you sketch the mass spectrum of gallium given its two naturally occurring isotopes with the following masses and natural abundances: Isotope Mass (amu) Abundance (%) Ga-69 68.92558 60.108 Ga-71 70.92470 39.892?
Ch.2 - Atoms & Elements
Chapter 2, Problem 74
The atomic mass of copper is 63.546 amu. Do any copper isotopes have an exact mass of 63.546 amu? Explain.
Verified step by step guidance1
Understand that the atomic mass of an element is a weighted average of the masses of its isotopes, based on their natural abundance.
Recognize that isotopes are atoms of the same element with different numbers of neutrons, and thus different masses.
Consider that the atomic mass of copper (63.546 amu) is not necessarily the mass of any single isotope, but rather an average value.
Identify the two main isotopes of copper: Cu-63 and Cu-65, with masses approximately 62.9296 amu and 64.9278 amu, respectively.
Conclude that no single isotope of copper has an exact mass of 63.546 amu, as this value is an average of the isotopic masses based on their relative abundances.
Related Practice
Open Question
Sketch the mass spectrum of magnesium given its three naturally occurring isotopes with the following masses and natural abundances: Isotope Mass (amu) Abundance (%) - Mg-24: 23.9850, 78.99% - Mg-25: 24.9858, 10.00% - Mg-26: 25.9826, 11.01%.
Textbook Question
The atomic mass of fluorine is 18.998 amu, and its mass spectrum shows a large peak at this mass. The atomic mass of chlorine is 35.45 amu, yet the mass spectrum of chlorine does not show a peak at this mass. Explain the difference.
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Textbook Question
An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9042 amu. Find the atomic mass of this element and identify it.
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Textbook Question
An element has four naturally occurring isotopes with the masses and natural abundances given here. Find the atomic mass of the element and identify it.
Isotope Mass (amu) Abundance (%)
1 135.90714 0.19
2 137.90599 0.25
3 139.90543 88.43
4 141.90924 11.13
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Textbook Question
Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass and natural abundance of Br-79.
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