How Do You Calculate Total Pressure in Mixed Gas Systems?

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Homework Help Overview

The discussion revolves around calculating total pressure in mixed gas systems, specifically involving nitrogen and oxygen in different volumes and pressures. The original poster presents two questions related to gas laws and pressure calculations while expressing confusion over the answers provided.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to apply the ideal gas law and partial pressure concepts to determine total pressure in mixed gas scenarios. They question how the provided answers were derived and express uncertainty about their own calculations.

Discussion Status

The discussion is currently focused on clarifying the calculations related to gas pressures. Some participants have pointed out the need to keep the conversation within the appropriate section of the forum, indicating a potential shift in focus rather than resolving the original questions.

Contextual Notes

There are indications of confusion regarding the application of gas laws, and the original poster's calculations differ significantly from the provided answers. The discussion also touches on forum etiquette regarding posting in multiple sections.

ravadongon
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Question 1: 5L of nitrogen at 100kPa and 298K and 5L of oxygen at 200kPa are pumped into a evacuated 50L cylinder. Temperature remains constant, what is the total pressure in the cylinder?

Correct Answer: 30kPa
My answer: 300 kPa

Question 2: A 10L flask containing nitrogen at 500mmHg is connected via a closed tap to a 4L flask containing oxygen at 800mmHg pressure, if the tap is opened what will be the final pressure assuming temperature remains constant?

Answer: 586mmHg
My answer: 1300mmHg

Formulas I used:

pV = nRT (to find mols)
PA = (nA/nA+nB) x PT

How did they get these answers...cos I can't seem to get them..?? Any help would be appreciated...
 
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This thread is also in the Chemistry section. It has a reply in this section so I would suggest that it continues in that section of the forums.

Please do not double post ravadongon.

The Bob (2004 ©)
 
Last edited:
The Bob said:
This thread is also in the Chemistry section. It has a reply in this section so I woul suggest that it continues in that section of the forums.

Please do not double post ravadongon.

The Bob (2004 ©)

sorry, I'll get a mod to delete it...
 
ravadongon said:
sorry, I'll get a mod to delete it...
It's alright. I am not telling you off in a way where I am going to take my leather belt off. :-p

Believe me, we all get told once, even if we did not start the thread. Just make sure you are not one of the people that have to be told more than once. :smile: :-p

So long as no one else posts here, there should be no need to get a moderator to delete it. :smile:

The Bob (2004 ©)
 

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