Isotopic abundance, percentage
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Isotopic abundance, percentage

[From: ] [author: ] [Date: 11-05-25] [Hit: ]
0.45 and 0.55 add up to 1.Remember to always use the decimal abundance in calculations of this type.http://www.chemteam.......
Natural Sb consists of two isotopes, 121Sb (120.904 amu) and 123Sb (122.904
amu). Calculate the percent abundance of the heavier of the two isotopes.

The solution was
121.8 = 122.904x + 120.904(1-x)
ANS: 45%

the thing i don't understand is the whole x and (1-x) deal

-
x is the abundance of the heavier isotope, expressed as a decimal (not a percentage)

1 - x is the abundance of the lighter isotope because 1 is the decimal representation of 100%

45% and 55% add up to 100%

0.45 and 0.55 add up to 1.

Remember to always use the decimal abundance in calculations of this type.

More sample problems here:

http://www.chemteam.info/Mole/AvgAtomicW…
1
keywords: Isotopic,percentage,abundance,Isotopic abundance, percentage
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