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Isotopes

#### Q. This exercise will lead you to verify that the average atomic mass of magnesium is 24.31 amu, based on the following information: What is the value: atomic mass x fractional abundance for 26-Mg? For now, report your answer to three decimal places. Mass contribution of 24-Mg = 18.946 amu Mass contribution of 25-Mg = 2.499 amu

Solved • Jan 24, 2020

Isotopes

#### Q. This exercise will lead you to verify that the average atomic mass of magnesium is 24.31 amu, based on the following information: What is the value: atomic mass x fractional abundance for 25-Mg? For now, report your answer to three decimal places. Mass contribution of 24-Mg = 18.946 amu

Solved • Jan 24, 2020

Isotopes

#### Q. This exercise will lead you to verify that the average atomic mass of magnesium is 24.31 amu, based on the following information: What is the value: atomic mass x fractional abundance for 24-Mg? For now, report your answer to three decimal places. Fractional abundance of 24-Mg = 0.7899

Solved • Jan 24, 2020

Isotopes

#### Q. The element lanthanum has two stable isotopes, lanthanum-138 with an atomic mass of 137.9068 amu and lanthanum-139 with an atomic mass of 138.9061 amu. From the atomic mass of La = 138.91 one conclude that:

Solved • Jan 24, 2020

Isotopes

#### Q. A certain element consists of two stable isotopes. The first has an atomic mass of 7.0160 amu and a percent natural abundance of 92.58%. The second has an atomic mass of 6.0150 amu and a percent natural abundance of 7.42%. What is the atomic mass of the element?

Solved • Jan 24, 2020

Isotopes

#### Q. An isotope of indium is found to have an atomic mass that is 9.5734 times the atomic mass of carbon-12. What is the atomic mass of this isotope?

Solved • Jan 24, 2020

Isotopes

#### Q. An atom of the isotope chlorine-39 consists of how many protons, neutrons, and electrons? (p = proton, n= neutron, e = electron) A) 17 p, 17 n. 22 e B) 39 p, 38 n, 39 e C) 22 p, 17 n, 17 e D) 17 p, 39 n, 17 e E) 17 p, 22 n, 17 e

Solved • Jan 22, 2020