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A sample of Element X is found to contain 75.15% of isotope type 1 (83.9118 amu) and 25.85% of isotope type 2 (86.9092 AMU). Calculate the average atomic mass.

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Eduard22sly

The average atomic mass of the element X is 85.5257 amu

Data obtained from the question

Ffrom the question given above, the following data were obtained:

  • Abundance of isotope 1 = 75.15%
  • Mass of isotope 1 = 83.9118 amu
  • Abundance of isotope 2 = 25.85%
  • Mass of isotope isotope = 186.9092 amu
  • Average atomic mass =?

How to determine the average atomic mass

The average atomic mass of the element can be obtained as illustrated below:

Average atomic mass = [(Mass of isotope 1 × Abundance of isotope 1)/100] + [(Mass of isotope 2 × Abundance of isotope 2)/100]

Average atomic mass = [(83.9118 × 75.15)/100] + [(86.9092 × 25.85)/100]

Average atomic mass = 85.5257 amu

Thus, the average atomic mass of the element is 85.5257 amu

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