What is the partial pressure of carbon dioxide?

1 Answer
Mar 24, 2018

Answer:

In what gaseous mixture? The air we breathe?

Explanation:

Well, in #100*g# of dry air there are #78.09*g# #"dinitrogen"#, #20.95*g# #"dioxygen"#, #0.93*g# #"argon"#, and #0.04*g# #"carbon dioxide"#, and small amounts of other gases.

And thus #chi_(CO_2)#, #"the mole fraction of carbon dioxide,"#

#=((0.04*g)/(44.01*g*mol^-1))/((78.09*g)/(28.01*g*mol^-1)+(20.95*g)/(32.0*g*mol^-1)+(0.04*g)/(44.01*g*mol^-1)+(0.93*g)/(39.9*g*mol^-1))#

#chi_(CO_2)=2.62xx10^-4#...and since the pressure is assumed to be #1*atm#...#p_(CO_2)=1*atmxxchi_(CO_2)=2.62xx10^-4*atm#..