Average atomic mass of magnesium is 24.31 a.m.u. This magnesium is composed of 79 mole % of 24Mg and remaining 21 mole % of 24Mg and 26Mg. Calculate mole % of 26Mg.

Question

Average atomic mass of magnesium is 24.31 a.m.u. This magnesium is composed of 79 mole % of 24Mg and remaining 21 mole % of 24Mg and 26Mg. Calculate mole % of 26Mg. (A) 10 (B) 11 (C) 15 (D) 16

Tardigrade Admin · Accepted Answer

Let mole % of 26Mg be x ∴ ((21 - x)25 + x(26) + 79(24)/100) = 24.31 x = 10 %

Q. Average atomic mass of magnesium is $24.31$ a.m.u. This magnesium is composed of $79$ mole of $^{24} M g$ and remaining $21$ mole of $^{24} M g$ and $^{26} M g$ . Calculate mole of $^{26} M g$ .

$10$

$11$

$15$

$16$

Let mole of $^{26} M g$ be $x$
$∴ \frac{( 21 - x ) 25 + x ( 26 ) + 79 ( 24 )}{100} = 24.31$
$x = 10%$

Q. Average atomic mass of magnesium is 24.31 a.m.u. This magnesium is composed of 79 mole of 24Mg and remaining 21 mole of 24Mg and 26Mg. Calculate mole of 26Mg.

10

11

15

16