Air contains \( 79 \% \mathrm{~N}_{2} \) and \( 21 \% \mathrm{O}_{2} \) by volume. If the barome...

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Air contains \( 79 \% \mathrm{~N}_{2} \) and \( 21 \% \mathrm{O}_{2} \) by volume. If the barometric pressure is \( 750 \mathrm{~mm} \mathrm{Hg} \) the partial pressure of oxygen is:
(A) \( 157.5 \mathrm{~mm} \) of \( \mathrm{Hg} \)
(B) \( 175.5 \mathrm{~mm} \) of \( \mathrm{Hg} \)
(C) \( 315.0 \mathrm{~mm} \) of \( \mathrm{Hg} \)
(D) none of these
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