An element with density $2.8 \ g \ cm^{-3}$ forms an $fcc$ unit cell having an edge length of $4 \times 10^{-8} \ cm$. Calculate the molar mass of the element.

  • A
    $33.0 \ g \ mol^{-1}$
  • B
    $22.0 \ g \ mol^{-1}$
  • C
    $27.0 \ g \ mol^{-1}$
  • D
    $36.0 \ g \ mol^{-1}$

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