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A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370 are Lithium-7 (7.016 amu). Which student correctly calculated the correct average atomic mass and why? Student 1 calculated the average atomic mass as 6.94 amu. Student 1 determined the percent abundance for each isotope and then multiplied the percent abundance by the average atomic mass of its isotope and took the sum. Student 2 calculated the average atomic mass as 6.52 amu. Student 2 took the average of the mass of the two isotopes of lithium. Student 3 calculated the average atomic mass as 1.06 amu. Student 3 took the sum of the average atomic masses of the isotopes and multiplied by the ratio of lithium-6 to lithium-7. Student 4 calculated the average mass as 13.0 amu. Student 4 added the mass of the two isotopes.

A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370 are Lithium-7 (7.016 amu). Which student correctly calculated the correct average atomic mass and why? Student 1 calculated the average atomic mass as 6.94 amu. Student 1 determined the percent abundance for each isotope and then multiplied the percent abundance by the average atomic mass of its isotope and took the sum. Student 2 calculated the average atomic mass as 6.52 amu. Student 2 took the average of the mass of the two isotopes of lithium. Student 3 calculated the average atomic mass as 1.06 amu. Student 3 took the sum of the average atomic masses of the isotopes and multiplied by the ratio of lithium-6 to lithium-7. Student 4 calculated the average mass as 13.0 amu. Student 4 added the mass of the two isotopes.

General Chemistry - Standalone book (MindTap Course List)
General Chemistry - Standalone book (MindTap Course List)
11th Edition
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Chapter2: Atoms, Molescules, And Ions
Section: Chapter Questions
Problem 2.158QP: The element europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 amu, and 153Eu...
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A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370 are Lithium-7 (7.016 amu). Which student correctly calculated the correct average atomic mass and why? Student 1 calculated the average atomic mass as 6.94 amu. Student 1 determined the percent abundance for each isotope and then multiplied the percent abundance by the average atomic mass of its isotope and took the sum. Student 2 calculated the average atomic mass as 6.52 amu. Student 2 took the average of the mass of the two isotopes of lithium. Student 3 calculated the average atomic mass as 1.06 amu. Student 3 took the sum of the average atomic masses of the isotopes and multiplied by the ratio of lithium-6 to lithium-7. Student 4 calculated the average mass as 13.0 amu. Student 4 added the mass of the two isotopes.
Transcribed Image Text:A sample of lithium consists of 400 atoms. 30 atoms are the isotope Lithium-6 (6.015 amu) and 370 are Lithium-7 (7.016 amu). Which student correctly calculated the correct average atomic mass and why? Student 1 calculated the average atomic mass as 6.94 amu. Student 1 determined the percent abundance for each isotope and then multiplied the percent abundance by the average atomic mass of its isotope and took the sum. Student 2 calculated the average atomic mass as 6.52 amu. Student 2 took the average of the mass of the two isotopes of lithium. Student 3 calculated the average atomic mass as 1.06 amu. Student 3 took the sum of the average atomic masses of the isotopes and multiplied by the ratio of lithium-6 to lithium-7. Student 4 calculated the average mass as 13.0 amu. Student 4 added the mass of the two isotopes.
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