OVERVIEW- In order to monitor certain bodily functions, patients are sometimes given radioactively labeled substances that doctors can follow throughout the body. One technique used for measuring sugar uptake is to label chemicals with radioactive fluorine. In this assignment, we will be investigating radiolabeling fluorine in other compounds. Question 1- The ideal radioisotope for monitoring sugar uptake is 18F. Based on the subatomic particles listed below, identify which neutral isotope would be best. Isotope 1: 9 protons, 9 neutrons Isotope 2: 10 protons, 8 neutrons Isotope 3: 9 protons, 18 neutrons Isotope 4: 18 protons, 9 neutrons Question 2- Using a deuteron beam, a sample of isotopically enriched fluorine is generated, consisting of 18F and 19F. Because this is not a natural sample, the average atomic mass on the periodic table cannot be used! Given the following abundances in the sample, calculate the new atomic mass of the fluorine in the sample. 18F: 18.01 amu, 72% 19F: 19.008 amu, 28% Question 3- A 10.0 mg sample is made up of isotopically enhanced C6F14. This chemical is used to provide oxygen to the lungs of severe burn victims, and doctors want to use the radioactive version to see if it moves from the lungs to other places in the body. Using the molar mass of fluorine that you calculated for this sample (previous question), determine how many moles of labeled fluorine are present in the sample. If you did not complete the previous question, use 24.00 g/mol for the F in this sample. Question 4- Due to a (severe) labeling mistake, you find a sample of C6F14 that may or may not be labeled! Through some clever experimentation using gases, you learn that the sample contains 0.873 moles of C6F14 and has a mass of 295.111 g. Has this sample been isotopically enhanced? How do you know?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter18: Nuclear Chemistry

Section: Chapter Questions

Problem 58QRT

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Question

OVERVIEW-

In order to monitor certain bodily functions, patients are sometimes given radioactively labeled substances that doctors can follow throughout the body. One technique used for measuring sugar uptake is to label chemicals with radioactive fluorine. In this assignment, we will be investigating radiolabeling fluorine in other compounds.

Question 1-

The ideal radioisotope for monitoring sugar uptake is ¹⁸F. Based on the subatomic particles listed below, identify which neutral isotope would be best.

- Isotope 1: 9 protons, 9 neutrons
- Isotope 2: 10 protons, 8 neutrons
- Isotope 3: 9 protons, 18 neutrons
- Isotope 4: 18 protons, 9 neutrons

Question 2-

Using a deuteron beam, a sample of isotopically enriched fluorine is generated, consisting of ¹⁸F and ¹⁹F. Because this is not a natural sample, the average atomic mass on the periodic table cannot be used! Given the following abundances in the sample, calculate the new atomic mass of the fluorine in the sample.

- ¹⁸F: 18.01 amu, 72%
- ¹⁹F: 19.008 amu, 28%

Question 3-

A 10.0 mg sample is made up of isotopically enhanced C₆F₁₄. This chemical is used to provide oxygen to the lungs of severe burn victims, and doctors want to use the radioactive version to see if it moves from the lungs to other places in the body. Using the molar mass of fluorine that you calculated for this sample (previous question), determine how many moles of labeled fluorine are present in the sample.

If you did not complete the previous question, use 24.00 g/mol for the F in this sample.

Question 4-

Due to a (severe) labeling mistake, you find a sample of C₆F₁₄ that may or may not be labeled! Through some clever experimentation using gases, you learn that the sample contains 0.873 moles of C₆F₁₄ and has a mass of 295.111 g. Has this sample been isotopically enhanced? How do you know?

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