$A$ sample of $O_2$ gas is collected over water at $23\,^oC$ and a barometric pressure of $751\,mm\,Hg$. What is the partial pressure of the $O_2$ gas in this sample? (Vapor pressure of water at $23\,^oC$ is $21\,mm\,Hg$)
- A$21\,mm\,Hg$
- B$751\,mm\,Hg$
- C$0.96\,atm$
- D$1.02\,atm$
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