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2 isotop = 69Ga dan 70Ga
dari 5 atom terdapat 3 atom 69Ga
jadi %69Ga = 3/5 =0,6
dan %70Ga = 2/5 = 0,4
ditanyakan = Ar ?
Ar = (%69Ga x 69 + %70Ga x 70)
Ar = ( 0,6 x 69 + 0,4 x 70)
Ar = 69,4