[Campbell Biology P.988] At sea level, the total atmospheric pressure is 760 mm Hg. Given th... | Practice Question

At sea level, the total atmospheric pressure is 760 mm Hg. Given that oxygen O2 makes up 21% of the atmosphere by volume, what is the partial pressure of O2 PO2 at sea level, according to the text?

  • A: 760 mm Hg
  • B: 160 mm Hg
  • C: 0.29 mm Hg
  • D: 21 mm Hg

Explanation

The text states that 'the partial pressure of O2 is 0.21 × 760, or about 160 mm Hg.'