Answer to Question #290426 in Physical Chemistry for Elham

Question

Three of the primary components of air are carbon dioxide, nitrogen, and oxygen. In a sample containin a mixture of only these gases at exactly 1 atm, the partial pressures of carbon dioxide and nitrogen are given as

P

C

O

2

=

0.285

P

CO

2

​

​

=0.285

torr and

P

N

2

=

593.525

P

N

2

​

​

=593.525

torr. What is the partial pressure of oxygen?

Answer 1

Partial pressure of CO₂ = p = 0.285 torr = 0.000375 atm

Partial pressure of N₂

= p'

593.525 torr = 593.525 / 760 atm

= 0.781 atm .

Partial pressure of O₂ = p" .

Sum of all partial pressure = 1 atm .

P + p' + p" = 1 atm

P" = 1- p - p' = 1 - 0.000375 - 0.781 =

0.2186 atm