Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 amu and the mass of lithium-7 is 7.01601 amu.Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.Express your answers using one decimal place. Enter your answers separated by a comma.

Question
Asked Sep 15, 2019

Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 amu and the mass of lithium-7 is 7.01601 amu.

Use the atomic mass of lithium to calculate the relative abundances of the two isotopes.
Express your answers using one decimal place. Enter your answers separated by a comma.
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Step 1

Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 amu and the mass of lithium-7 is 7.01601 amu.

Using the atomic mass of lithium, we have to calculate the relative abundances of the two isotopes.

Step 2

If an element has two isotopes, then its average atomic mass is equal to the sum of mass of each isotope multiplied by its relative abundance.

=>'(Atomic mass of Isotope x Relative abundance
Average Atomic mass=
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=>'(Atomic mass of Isotope x Relative abundance Average Atomic mass=

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Step 3

Average atomic mass of Lithium =6.941 amu

The mass of lithium-6 = 6.01512 amu

The mass of lithium-7 = 7...

Atomic mass of Li (Mass of lithium-6x x)
(Mass of lithium-7x y)
6.941 amu (6.01512 amu x x) + (7.01601 amu x y)
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Atomic mass of Li (Mass of lithium-6x x) (Mass of lithium-7x y) 6.941 amu (6.01512 amu x x) + (7.01601 amu x y)

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