The atmospheric pressure is 1.0 atm and Henry’s law constant for O2 is 1.66 x 10−6 M/mm Hg at 25 °C. Assume air contains 21% oxygen. Calculate the partial pressure of oxygen. (21% of air is oxygen and the mole fraction of O2 is 0.21).

The atmospheric pressure is 1.0 atm and Henry’s law constant for O2

1.	The atmospheric pressure is 1.0 atm and Henry’s law constant for O2 is 1.66 x 10−6 M/mm Hg at 25 °C. Assume air contains 21% oxygen. Calculate the partial pressure of oxygen. (21% of air is oxygen and the mole fraction of O2 is 0.21).
A.	180 mm Hg
B.	130 mm Hg
C.	120 mm Hg
D.	160 mm Hg
Answer» E.

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The atmospheric pressure is 1.0 atm and Henry’s law constant for O2 is 1.66 x 10−6 M/mm Hg at 25 °C. Assume air contains 21% oxygen. Calculate the partial pressure of oxygen. (21% of air is oxygen and the mole fraction of O2 is 0.21).

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