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11 Unsolved Questions about Average Atomic Mass.
Typology: Exercises
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Average Atomic Mass Practice Problems
85 Rb and
87 Rb. If the abundance of
85 Rb is 72.2% and the abundance of
87 Rb is 27.8%, what is the average atomic mass of rubidium?
three common isotopes. If the abundance of
234 U is 0.01%, the abundance of
235 U is 0.71%, and the abundance of
238 U is 99.28%, what is the average atomic mass of uranium?
46 Ti (8.0%),
47 Ti (7.8%),
48 Ti (73.4%), (^49) Ti (5.5%), 50 Ti (5.3%). What is the average atomic mass of titanium?
a)
113 In and
115 In has an average mass of 114.8 u. b) Naturally occurring silicon consists of three isotopes,
28 Si,
29 Si, and
30 Si, whose atomic masses are 27.9769, 28.9865, and 29.9838, respectively. The most abundant isotope is
28 Si, which accounts for 92.23% of naturally occurring silicon. Given that the observed atomic mass of silicon is 28.0855, calculate the percentages of
29 Si and
30 Si in nature.