An element P (atomic weight = 80 g/mol) having fcc structure, calculate number of unit cells in 8 gm of P

• A

  $0.4\times {\mathrm{N}}_{\mathrm{A}}$
• B

  $0.1\times {\mathrm{N}}_{\mathrm{A}}$
• C

  $4\times {\mathrm{N}}_{\mathrm{A}}$
• Correct answer
  D

  None of these

Hence, the correct answer is option: 'D'.