High School

An unidentified element Xz consists of two naturally occurring isotopes having masses of 100.0 amu and 102.0 amu. A sample of Xz was found to contain 25.0% of 100Xz and 75.0% of 102Xz. What is the atomic mass of Xz? 101.0 amu 100.5 amu 101.5 amu 100.3 amu

Answer :

Final answer:

The atomic mass of element Xz is 101.5 amu.

Explanation:

An unidentified element, Xz, consists of two naturally occurring isotopes with masses of 100.0 amu and 102.0 amu. The sample of Xz was found to contain 25.0% of 100Xz and 75.0% of 102Xz isotopes. To calculate the atomic mass of Xz, we multiply the mass of each isotope by their relative abundance (percent composition as a decimal) and sum the results:

  1. Atomic mass of Xz = (100.0 amu × 0.25) + (102.0 amu × 0.75)
  2. Atomic mass of Xz = 25.0 amu + 76.5 amu
  3. Atomic mass of Xz = 101.5 amu

So, the atomic mass of Xz is 101.5 amu.

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