Unit 1: Average Atomic Mass and % Abundance

QuizÂ by Hugh King

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7 questions
• Q1
A sample of phosphorous was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. Based on the data, what is the most abundant isotope of Phosphorus?
Phosphorus-31.97
Phosphorus-29
Phosphorus-31
Phosphorus-32
30s
• Q2
A sample of phosphorous was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. Based on the data, which statement gives the best reasoning for the average atomic mass for the isotopes is 31.14 amu?
It is the weighted average mass of all of the different isotopes found in a sample of phosphorus.
It is the total number of neutrons, protons, and electrons in the isotopes found in a sample of phosphorus.
It is the total number of neutrons and electrons in the isotopes found in a sample of phosphorus.
It is an integer number.
30s
• Q3
The element gallium has two naturally occurring isotopes, gallium-69 (68.9256 amu) and gallium-71 (70.9247 amu). The average atomic mass of gallium listed on the periodic table of the elements is 69.723 amu. Which naturally occurring isotope gallium-69 or gallium 71 is the most abundant?
The most abundant isotope of the element gallium is gallium-71 because it has more neutrons resulting in more distance between the protons
The most abundant isotope of the element gallium is gallium-69 because it has fewer neutrons.
The most abundant isotope of the element gallium is gallium-69 because the average atomic mass of the element is closer to its mass.
The most abundant isotope of the element gallium is gallium-71 because it has a greater mass.
30s
• Q4
An element has two isotopes. One isotope has a relative abundance of 75.0% and mass 25.0 amu. The second isotope has a relative abundance of 25.0% and 28.0 amu. What is the average atomic mass of the element?
26.5 amu
It is the total number of neutrons, protons, and electrons in the isotopes found in a sample of that element.
27.3 amu
25.8 amu
30s
• Q5
Chlorine has two stable isotopes accounting for nearly all of the Cl atoms in the universe. Their atomic masses appear below: Cl-35 atomic mass: 34.97 amu Cl-37 atomic mass: 36.97 amu Which isotope has a larger percent abundance, Cl-35 or Cl-37, given that the average atomic mass of Chlorine is 35.45 amu?
cannot be determined from this data
Cl-35
Cl-37
both have the same percentage
30s
• Q6
A sample of copper was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. Based on the data, what is the most abundant isotope of Copper? Isotope Mass (amu) Percent Abundance Copper-63 62.98 69.1% Copper-65 64.93 30.9%
It is the total number of neutrons and electrons in the isotopes found in a sample of copper.
It is the total number of neutrons, protons, and electrons in the isotopes found in a sample of copper.
It is the weighted average mass of all of the different isotopes found in a sample of copper.
It is an integer number.
30s
• Q7
A sample of copper was isolated and analyzed to determine the percent abundance of each isotope. The results are recorded in the table. What is the average atomic mass of Copper? Isotope Mass (amu) Percent Abundance Copper-63 62.98 69.1% Copper-65 64.93 30.9%
63.55 amu
64.93 amu
It is the total number of neutrons, protons, and electrons in the isotopes found in a sample of copper.
62.98 amu
30s

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