$A$ sample of phosphorus trichloride $(PCl_3)$ contains $1.4$ moles of the substance. How many atoms are there in the sample?

  • A
    $4$
  • B
    $5.6$
  • C
    $3.372 \times 10^{24}$
  • D
    $8.431 \times 10^{23}$

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