The lowest pressure (the best Vacuum) that can be created in the laboratory at $27$ degree is $10^{-11} \;{mm}$ of $Hg$. At this pressure, the number of ideal gas molecules per ${cm}^{3}$ will be
  • A$3.22 \times  10^{12}$
  • B$1.61 \times  10^{12}$
  • C$3.21 \times  10^6$
  • D$3.22 \times  10^5$
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