Question

station 4
magnesium isotopes: magnesium - 24 (78.7%), magnesium - 25 (10.1%), manesiumg - 26 (11.2%)
calculate the average atomic mass of magnesium.

Explanation:

Step1: Multiply mass of Mg - 24 by its abundance

$24\times0.787 = 18.888$

Step2: Multiply mass of Mg - 25 by its abundance

$25\times0.101=2.525$

Step3: Multiply mass of Mg - 26 by its abundance

$26\times0.112 = 2.912$

Step4: Sum up the results

$18.888 + 2.525+2.912=24.325$

Answer:

$24.325$