Posted: November 15th, 2022

Discuss why technetium and promethium have whole number atomic masses and have a bracket symbol on the periodic table.

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1. Variations in average atomic mass may be observed for elements obtained from different sources. Lithium provides an example of this. The isotopic composition of lithium from naturally occurring minerals is 7.5% 6Li and 92.5% 7Li, which have masses of 6.01512 amu and 7.01600 amu, respectively. A commercial source of lithium, recycled from a military source, was 3.75%6Li (and the rest 7Li). Calculate the average atomic mass values for each of these two sources. Show your work for partial credit.
2. Discuss why technetium and promethium have whole number atomic masses and have a bracket symbol on the periodic table.
3..A throat spray is 1.40% by mass phenol, C6H5OH, in water. If the solution has a density of 0.9956 g/mL, calculate the molarity of the solution. You must show all work for credit.
4. Polymers are large molecules composed of simple units repeated many times. Thus, they often have relatively simple empirical formulas. Calculate the empirical formulas of the polyethylene: 86% C, 14% H. You must show all work for credit.

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