November 7th, 2016, 08:47 AM  #1 
Member Joined: Oct 2016 From: Slovenia, Europe Posts: 46 Thanks: 5  partial air pressure task. help please
calculate the density of air at the temperature 15°C (=288K) and at the pressure 99.5 kPa. Structure of the air is: 80% of volume is nitrogen, 20% of volume is oxygen. I am having problem with this task. Is there any correlation between partial pressure and partial volume? I already know that: density(air)= ( m(N2)+m(O2) ) / V 
November 7th, 2016, 10:57 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 16,936 Thanks: 1253 
Are you given the value of the universal gas constant?

November 7th, 2016, 11:19 AM  #3 
Member Joined: Oct 2016 From: Slovenia, Europe Posts: 46 Thanks: 5 
Well, it is not given, but we are supposed to know that R= 8.314 kPa L mol1K1

November 7th, 2016, 11:28 AM  #4 
Member Joined: Oct 2016 From: Slovenia, Europe Posts: 46 Thanks: 5  http://pho.to/ASPHF I already know that, but I do not know how to continue....

November 7th, 2016, 11:47 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 16,936 Thanks: 1253 
Calculate the specific gas constant for the gas mixture specified in the question, so that you can then use density = pressure/(specific gas constant × absolute temperature).


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