Chemistry – Atoms, elements and compounds - Isotopes | e-Consult
Atoms, elements and compounds - Isotopes (1 questions)
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Solution:
Applying the formula for relative atomic mass:
Ar = (Mass of X-40 × Abundance of X-40) + (Mass of X-41 × Abundance of X-41)
We are given:
- Mass of X-40 = 40.0
- Abundance of X-40 = 25.0% = 0.250
- Mass of X-41 = 41.0
- Abundance of X-41 = 75.0% = 0.750
Therefore:
Ar = (40.0 × 0.250) + (41.0 × 0.750)
Ar = 10.0 + 30.75
Ar = 40.75
The relative atomic mass of element X is 40.75.