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Q.

Average atomic mass of magnesium is 24.31 amu. This magnesium is composed of 79 mole% of $^{24} M g$ and remaining 21 mole % of $^{25} M g$ and $^{26} M g .$ Calculate mole % of $^{26} M g .$

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a

10

b

11

c

15

d

16

answer is A.

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Detailed Solution

Average atomic mass $= \frac{\sum % \times Atomic weight}{100}$

Let mole % of $^{26} M g$ be $x$

$∴ \frac{(21 - x) 25 + x (26) + 79 (24)}{100} = 24.31$

$x = 10 %$

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