The number of air molecules in a $(5 \,m \times 5 \,m \times 4 \,m )$ room at standard temperature and pressure is of the order of
  • A$6 \times 10^{23}$
  • B$3 \times 10^{24}$
  • C$3 \times 10^{27}$
  • D$6 \times 10^{30}$
KVPY 2011, Medium
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