The proof that the atomic mass of lithium, Li (atomic number 3), is 6.941 amu .

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Chapter 9, Problem 41TS

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The proof that the atomic mass of lithium, Li (atomic number 3), is 6.941 amu.

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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 7Li with a mass of 7.0160040 amu. What are the percent isotopic abundances of lithium? A Li = 9.87%, Li = 90.13% 6Li = 7.49%, 7Li = 92.51% Li = 9.42%, Li = 90.58% Li = 8.26%, "Li = 91.74%

Boron has two naturally occurring isotopes, boron-10, andboron-11. Boron-10 has a mass of 10.0129 relative tocarbon-12 and makes up 19.78 percent of all naturallyoccurring boron. Boron-11 has a mass of 11.00931 comparedto carbon-12 and makes up the remaining 80.22 percent. What isthe atomic weight of boron?

A periodic table might list the average atomic mass of magnesium as being 24.312 u, which is the result of weighting the atomic masses of the magnesium isotopes according to their natural abundances on Earth.The three isotopes and their masses are 24Mg (23.985 04 u), 25Mg (24.985 84 u), and 26Mg (25.982 59 u). The natural abundance of 24Mg is 78.99% by mass (that is, 78.99% of the mass of a naturally occurring sample of magnesium is due to the presence of 24Mg).What is the abundance of (a) 25Mg and (b) 26Mg?