If $1 \, L$ flask contains $O_2$ at a pressure of $7.6 \times 10^{-10} \, mm \, Hg$ at $0 \, ^\circ C$,then the number of $O_2$ molecules will be ......
- A$7.76 \times 10^{-10} \, N_A$
- B$4.46 \times 10^{-14} \, N_A$
- C$4.46 \times 10^{-10} \, N_A$
- D$7.76 \times 10^{-14} \, N_A$
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