Asked by Miley

What is partial pressure?
Answered by Damon
First - scroll down to your question about how long to move 17 feet. I think I finally got it.
Answered by Miley
say what???
Answered by Damon
Now partial pressure means that if you have two(or more) gases in a bottle, their pressures add to a total pressure, although their volumes are the same bottle volume and their temperatures are the same.
so if you are doing P V = n R T
for O2 and N2 in a bottle
then V and T and R are the same for both
but we will have different n for each and different P for each.
To get the total pressure we would add the O2 pressure to the N2 pressure.
Answered by Damon
Sorry, that was Megan with the hard math question
Answered by Miley
okay thanks:) can you explain this one to me.... a box with a volume of 22.4 L CONTAINS 1.0 mol of nitrogen and 2.0 mol of hydrogen at zero degrees celcius. Which of the flollowing statements is true?
the correct statement is the partial pressure of N2 is 101kPa. How come??
Answered by Miley
ohhhhh i ccc. Thanks for your help:) you are brilliant!!!!
Answered by Damon
One mole of an ideal gas at 1 atm which is about 101 kPa at 0 deg C occupies about 22.4 liters
Therefore the pressure of one mole of N2 at those conditions will be about one atm or 101 kPa

Of course the TOTAL pressure in the box will be 3 atm with additional 2 atm from the H2
Answered by Miley
OHHHHHHHHHHHHHH because those are the STP'S value's right?? Thanks Genius
Answered by Damon
You can check that easily
V = n R T/P
V = 1 * 8.3 * 273 / 101 kPa
V =22.4 sure enough