Atmospheric pressure is 1 atm
Partial pressure of oxygen =O2 = 0.21 *1 atm = 0.21 atm
On mount Everest
Atmospheric pressure is 1/3 atm i.e. ( 1/3 ) *1 atm = 1/3 atm
Partial pressure of oxygen = 0.21 * ( 1/3) atm = 0.07 atm
Therefore the partial pressure of oxygen on mount Everest is 0.07 atm which is one-third of its value at sea level
