How to find the natural abundance of antimony 121 and 123?

How to find the natural abundance of antimony 121 and 123?
You are given the mass of antimony 121 as 120.904 and 123 as 122.904 and we are supposed to find the natural abundance percentage by using the periodic table value of antimony(121.760)

Best answer:

Answer by athome
%(Sb-121) * 120.904 + %(Sb-123) * 122.904 = 121.760

%(Sb-121) + %(Sb-123) = 1

1 – %(Sb-121) = %(Sb-123)

%(Sb-121) * 120.904 + (1 – %(Sb-121) ) * 122.904 =121.760

1.144 = 2 * %(Sb-121)

%(Sb-121) = 57.2 %

%(Sb-123) = 42.8%

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