Calculate the relative atomic mass of magnesium which have the following isotopic composition: ~ magnesium-24 : 78.6% ~ magnsium-25 : 10.1 % ~ magnesium-26 : 11.3%

21.802

Explanation:

R.A.M = m1a1 +m2a2

m1= 24 a1=78.6% , m2=26 a2=11.3%

= 24×78.6/100 + 26×11.3/100

= 18.864 + 2.938

= 21.802

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