An element consists of a mixture of three isotopes $A$, $B$, and $C$ of masses $m_1$, $m_2$, and $m_3$ respectively. If the relative abundances of the three isotopes $A$, $B$, and $C$ are in the ratio $2:3:5$, the average mass of the element is:

  • A
    $0.2 m_1 + 0.3 m_2 + 0.5 m_3$
  • B
    $2 m_1 + 3 m_2 + 5 m_3$
  • C
    $0.4 m_1 + 0.6 m_2 + m_3$
  • D
    $4 m_1 + 6 m_2 + 10 m_3$

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