Because of the Relatively High Altitude of Antonito, Colorado, the Town

Multiple Choice

Because of the relatively high altitude of Antonito, Colorado, the town has a normal barometric pressure of about 600 mm Hg rather than 760 mm Hg as at sea level. The partial pressure of O₂ in Antonito's air is approximately _______ mm Hg.

A) 75
B) 126
C) 160
D) 76
E) 21