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Average atomic mass

Chemistry • Atoms & Subatomic Particles • Original Scenario-Based • 1 questions

Average atomic mass Original Scenario-Based Download PDF

Chemistry · Atomic Structure · Chemistry · Atoms & Subatomic Particles

1 Chemistry practice questions on Average atomic mass. Questions built around original scenarios.

Questions

  1. 1.

    During a deep-space expedition to an uncharted crystal comet, planetary scientists discover a pristine sample of a newly identified element, lumisite (Ls). High-resolution spectrometry reveals that lumisite consists of two stable isotopes: Ls-121 with an isotopic mass of 120.90 u and an abundance of 75.0%, and Ls-123 with an isotopic mass of 122.90 u and an abundance of 25.0%. Based on these measurements, what is the average atomic mass of lumisite in this sample?

    • A) 121.90 u
    • B) 122.40 u
    • C) 121.40 u
    • D) 120.90 u