jibraan0517
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Element X has two naturally occurring isotopes, 65X (isotopic mass 65.0234 amu, abundance 47.78%) and 67X (isotopic mass 67.1396 amu, abundance 52.22%). Calculate the atomic mass of element X.

_____amu

Respuesta :

Edufirst

Answer:

  • 66.1285 amu

Explanation:

The atomic mass of an element is equal to the weigthed average of the atomic masses of its isotopes:

  • atomic mass = ∑ (relative abundance × isotopic mass)

  • atomic mass = relative abundance of isotope ⁶⁵X × isotopic mass of isotope ⁶⁵X + relative abundance of isotope ⁶⁷X × isotopic mass of isotope ⁶⁷X

  • atomic mass = 47.78% × 65.0234 amu + 52.22% × 67.1396 amu

  • atomic mass = 66.1285 amu ← answer

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