What is meant by $1 \ amu$ or $1 \ u$?

  • A
    $1/12$ of the mass of a $C-12$ atom
  • B
    $1/14$ of the mass of a $N-14$ atom
  • C
    $1/16$ of the mass of an $O-16$ atom
  • D
    Mass of one proton

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The equivalent mass of a divalent metal is $31.82$. What is the mass of a single atom of this metal?

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