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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: qwerty123 on June 12, 2011, 02:21:57 AM

Title: Calculating amount of oxygen in 10mL container
Post by: qwerty123 on June 12, 2011, 02:21:57 AM

I am trying to quantify my data to make graphs, hope you can help  :)
I have a sealed 385mL bottle filled with 375mL wine. So I have 10mL left for air, of this 10mL how do I work out how much oxygen I have (just within this 10mL space)? Or alternatively, is it just 10mL or 10mg?
I am thinking i need to calculate the surface area and times by the % oxygen present in the atmosphere?
Or perhaps times density by 10? However, the density of air is 1.29kg/m³ so i would need to put my 10mL into kg?
But i am really not certain.
Thanks!

Title: Re: Calculating amount of oxygen in 10mL container
Post by: Borek on June 12, 2011, 06:12:52 AM

10 mL of air with 21% by volume of oxygen, means 2.1 mL of gaseous oxygen. Use ideal gas equation.

Title: Re: Calculating amount of oxygen in 10mL container
Post by: qwerty123 on June 12, 2011, 07:08:42 AM

I am trying to put that onto a ideal gas calculator (from google), it is asking for the pressure, volume (10ml), mass and temperature. I am not sure what to put for these, as I need to show all of my steps (as it is a highschool assignment, as well as needing to work this out for 375mL of air as well)
The bottle was opened and then resealed and stored in a refrigerator. So I suppose the temperature would be 4 degrees Celsius.
Thanks for your reply  :D

Title: Re: Calculating amount of oxygen in 10mL container
Post by: Borek on June 12, 2011, 05:19:28 PM

Quote from: qwerty123 on June 12, 2011, 07:08:42 AM

I am trying to put that onto a ideal gas calculator (from google)

Don't be a sissy, ideal gas equation isn't that hard.