I don't understand this Vapor Concept problem?

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Discussion Overview

The discussion revolves around a homework problem involving the behavior of oxygen gas under varying temperature and pressure conditions. Participants explore the application of gas laws, particularly the ideal gas law and Dalton's law, to determine the volume of gas at different states.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about the problem and the relevant equations, specifically questioning the use of P1+P2+P3=Ptotal.
  • Another participant suggests that the volume of a gas changes with pressure and temperature, hinting at a law that describes this behavior.
  • A participant proposes a calculation using the ideal gas law, presenting a formula but expressing doubt about the result.
  • Another participant critiques the initial equation provided, asserting that it does not relate to the ideal gas law but rather to Dalton's law, and offers a different approach to the problem.
  • There is a suggestion that the approach is correct, but a need for improved calculation skills is noted.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct application of gas laws or the validity of the calculations presented. Multiple competing views regarding the appropriate equations and methods remain evident.

Contextual Notes

There are unresolved assumptions regarding the application of gas laws and the specific conditions under which the calculations are made. The discussion reflects uncertainty in the mathematical steps and the definitions of the laws referenced.

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Homework Statement



If oxygen gas occupies 25mL at -25 'C and 65 mm Hg.
What is the volume at 25 'C and 350 mmHg?

Homework Equations



P1+P2+P3=Ptotal

The Attempt at a Solution


I am really not sure how to do this :(
I think maybe I figured it out. Please see below!
 
Last edited:
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I don't understand P1+P2+P3=Ptotal.

The volume of a gas changes, depending on pressure and temperature. Do you know a law that describes this? (It is a law that describes an ideal gas)
 
The ideal gas law equation

Ok I think I might have the answer this is what I cam up with but I am not sure...
Here it is:

25mL/248K = X/298K

Which equals 30.04mL (I still don't believe this is right)
 
Last edited:
Mackydoodle said:
P1+P2+P3=Ptotal

Mackydoodle said:
The ideal gas law equation

It has nothing to do with the ideal gas equation. If anything, it looks like Dalton's law.

Ok I think I might have the answer this is what I cam up with but I am not sure...
Here it is:

(P1V1)/T1=(P2V2)/T2

V2=(65x25x318) / (350x248) = 4.2

Correct approach, but you need to hone your calculator skills.
 

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