Chemistry – Atoms, elements and compounds - Isotopes | e-Consult
Atoms, elements and compounds - Isotopes (1 questions)
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Solution:
Using the formula for relative atomic mass:
Ar = (Mass of Isotope A × Abundance of Isotope A) + (Mass of Isotope B × Abundance of Isotope B)
We are given:
- Mass of Isotope A = 20.0 g/mol
- Abundance of Isotope A = 60.0% = 0.600
- Mass of Isotope B = 40.0 g/mol
- Abundance of Isotope B = 40.0% = 0.400
Therefore:
Ar = (20.0 × 0.600) + (40.0 × 0.400)
Ar = 12.0 + 16.0
Ar = 28.0
The relative atomic mass of the element is 28.0.