Question

An isotope A of mass 12 exists in 90%, isotope B of mass 13 exists in 6% and C of mass 14 exists in 4%. Find the average atomic mass of element​

Answer 1

Average atomic mass = F

1

M

1

+F

2M 2 +...+F nMn

Where F 1,F 2,...F n

is the fraction representing the natural abundance of the isotope and M is the weight of the isotope.

Avg. At. Mass = (0.85×11)+(0.10×12)+(0.05×13)

= 9.35+1.2+0.65

Therefore, the average atomic mass = 11.2

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Answer 2

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