Calculate the percentage of isotopes of neon which ishaving average atomic mass of 20.2 and the isotopes have the mass numbers 20 and 22.

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Solution

Let the abundance of Ne-20 be X.
Thus the abundance of Ne-22 = 1-X,

Now,
(20) x X + 22 x (1-X) = 20.2
20X + (22 - 22X) = 20.2

Rearranging,
2X = 22- 20.2 = 1.8
X = 0.90
Convering to % by multiplying by 100 = 90% of Ne-20

and 1-X = 0.1 i.e. 10 % of Ne-22

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Calculate the percentage of isotopes of neon which ishaving average atomic mass of 20.2 and the isotopes have the mass numbers 20 and 22.

Let the abundance of Ne-20 be X. Thus the abundance of Ne-22 = 1-X, Now, (20) x X + 22 x (1-X) = 20.2 20X + (22 - 22X) = 20.2 Rearranging, 2X = 22- 20.2 = 1.8 X = 0.90 Convering to % by multiplying by 100 = 90% of Ne-20 and 1-X = 0.1 i.e. 10 % of Ne-22

Let the abundance of Ne-20 be X.
Thus the abundance of Ne-22 = 1-X,

Now,
(20) x X + 22 x (1-X) = 20.2
20X + (22 - 22X) = 20.2

Rearranging,
2X = 22- 20.2 = 1.8
X = 0.90
Convering to % by multiplying by 100 = 90% of Ne-20

and 1-X = 0.1 i.e. 10 % of Ne-22