The average atomic mass of a mixture containing 79 mol % of 24Mg and remaining 21 mol % of 25Mg and 26Mg , is 24.31. % mol of 26Mg is

Engineering

Chemistry

Average Atomic and Molecular Masses

Question

The average atomic mass of a mixture containing 79 mol % of ²⁴Mg and remaining 21 mol % of ²⁵Mg and ²⁶Mg , is 24.31. % mol of ²⁶Mg is

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Let % mol of ²⁶Mg be x

$\frac{(21 - x) 25 + x (26) + 79 \times 24}{100} = 24 .31 : x = 10 %$