[oceanbreeze]

I'm stuck on this question! Help would be greatly appreciated.

A sample of mixed gases with a combined pressure of 740 mmHg are found to have the following partial pressures:
Nitrogen gas, 538 mmHg
Oxygen gas, unknown mmHg
H2O, 15 mmHg
Argon, 11 mmHg

What is the partial pressure of Oxygen gas?

[magician4]

"the sum total of all partial pressures in a gas mix will result in the total pressure of named gas mix"


might this be helpfull for you?


regards

Ingo

[oceanbreeze]

Yes, but I still don't understand how to answer the question. Would I use this equation? Px = Total gas pressure x (number of moles of O2/total moles of all gases).

[magician4]

if

[tex] \Sigma p_{partial} \ = \ p_{system \ , \ total} [/tex]

hence

[tex] p_{total} \ = \ p_{partial}1 \ +  \ p_{partial}2 \ +  ...  +     p_{partial}n [/tex]

... and you know p total , p1 , p2 , p3 (but not p4)

... and you know that those 4 gases are all there is ...

... what mathematical operation immediately comes into mind if you wish to calculated for the (unknown) p4 ?


regards

Ingo