Find the natural abundance of Mg-26. Express your answer using two significant f

Question

Find the natural abundance of Mg-26. Express your answer using two significant figures Constants | Periodic Table Magnesium has three naturally occurring isotopes Mg-24, Mg-25, and Mg-26). The atomic mass and natural abundance of Mg-24 are 23.9850 amu and 79 %. respectively. The atomic mass and natural abundance of Mg -25 are 24.9858 amu and 10 %, respectively. 11 % Submit Previous Answers Correct - PartB Find the atomic mass of Mg-26. Express your answer using two significant figures. amu Submit equest Answer

Explanation / Answer

Average atomic mass of Magnesium is = 24.3

Average atomic mass = ( X1M1 + X2M2  + X3M3  ) / (X1 + X2 + X3)

24.3 = ( 79 x 23.9850 + 10 x 24.9858 + 11 x M3 ) / (79+10+11)

24.3 = 18.94815 + 2.49858 + 0.11 M3

M3 = 25.9388 amu

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