The element lithium has an atomic weight of 6.941 amu. There are only two isotopes of lithium, Li with a mass of 6.0151223 amu and Li with a mass of 7.0160040 amu. What are the percent isotopic abundances of lithium? A Li = 9.87%, 7Li = 90.13% B Li = 7.49%, Li = 92.51% Li = 8.26%, "Li = 91.74% (D) Li = 9.42%, 7Li = 90.58% %3D
The element lithium has an atomic weight of 6.941 amu. There are only two isotopes of lithium, Li with a mass of 6.0151223 amu and Li with a mass of 7.0160040 amu. What are the percent isotopic abundances of lithium? A Li = 9.87%, 7Li = 90.13% B Li = 7.49%, Li = 92.51% Li = 8.26%, "Li = 91.74% (D) Li = 9.42%, 7Li = 90.58% %3D
Chemistry for Engineering Students
4th Edition
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Chapter2: Atoms And Molecules
Section: Chapter Questions
Problem 2.16PAE: The element gallium, used in gallium arsenide semiconductors, has an atomic weight of 69.72 amu....
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Transcribed Image Text:The element lithium has an atomic weight of 6.941 amu. There are only two isotopes of lithium, Li with a mass of 6.0151223 amu
and Li with a mass of 7.0160040 amu. What are the percent isotopic abundances of lithium?
A Li = 9.87%, 7Li = 90.13%
B Li = 7.49%, Li = 92.51%
Li = 8.26%, "Li = 91.74%
(D) Li = 9.42%, 7Li = 90.58%
%3D
Transcribed Image Text:A mercury atom emits light at many wavelengths, two of which are at (1) 404.7 nm and (2) 435.8 nm. Both of these transitions are
to the same final state. Determine the energy of each emitted wavelength (in J).
A E1 = 5.908 x 1019 J and E2 = 5.558 x10-19 )
(B E1 = 4.628 x 10-19 J and E2 = 4.968 x10-19 J
© E1 = 7.908 x 1o-19 ) and E2 = 6.558 x10-19 J
(D E1 = 4.908 x 10-19 J and E2 = 4.558 x10-19 J
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