Final volume of a gas using the ideal gas equations

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Discussion Overview

The discussion revolves around a problem involving the application of the combined gas equation to determine the final volume of a gas. Participants are addressing the necessary values and conditions required to solve the problem, including temperature conversions and the need for additional information about the second gas.

Discussion Character

  • Debate/contested, Homework-related, Technical explanation

Main Points Raised

  • One participant attempts to use the combined gas equation but expresses uncertainty about how to eliminate pressure units (psig and InHg) to find the final volume (V2).
  • Another participant questions whether the problem is stated exactly as given, indicating a need for clarity in the problem's wording.
  • Some participants note that without a mass or volume value for the second gas, it is impossible to determine all necessary values, suggesting that the problem may lack sufficient information.
  • One participant suggests that if the second gas had a mass, they could use the formula V = mRT/P, but they express doubt about the problem's completeness.
  • A later reply points out that the temperature conversions provided by the original poster need correction.

Areas of Agreement / Disagreement

Participants generally agree that there is insufficient information to solve the problem as presented, with multiple views on the implications of missing data. Disagreement exists regarding the correctness of the temperature conversions and the completeness of the problem statement.

Contextual Notes

Limitations include the lack of mass or volume for the second gas, which affects the ability to apply the gas laws fully. There are also unresolved issues regarding the accuracy of temperature conversions.

Krokodrile
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Homework Statement
An oxygen cylinder contains 1 ft^3 gas at `70 F and 200 Psig. What will the volume of the gas be if it passes into a receptacle of dry gas at 90 F and 0.3 inHg above atmospheric pressure? The barometer indicates 14.7 In/lb^2
Relevant Equations
P1V1/T1 = P2V2/T2
Hey there! for this problem i try to use the combinate gas ecuation. First of all the values its necesary to have it in absolutes:
70 F = 527.67 K
90 F = 549.67 K
The ecuation looks like: (200 psig) (1 ft^3)/529.67 K = (0.3 InHg) V2/549.67 K I can eliminate "K" but not psig with InHg for obtain the ft^3 of V2.

And i don't know for what its the value of the barometer.
 
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Is this the exact wording of the problem?
 
Chestermiller said:
Is this the exact wording of the problem?
yes, it is. The word-word statement. Meanwhile i try to resolved, i noticed that if don't have a mase or a volume value in the second gas i can't obtain all the values of that gas. But, yes, its the exact wording of the problem say be the teacher. So, i guees that its possible to resolve
 
Krokodrile said:
yes, it is. The word-word statement. Meanwhile i try to resolved, i noticed that if don't have a mase or a volume value in the second gas i can't obtain all the values of that gas. But, yes, its the exact wording of the problem say be the teacher. So, i guees that its possible to resolve
Well, in my judgment, there is not enough information provided to answer this question.
 
Chestermiller said:
Well, in my judgment, there is not enough information provided to answer this question.
Yes. i agree. Maybe if the second gas had mass i wold to use V = mRT/P, but this is not the case. I don't find any formule of the gases for resolve the problem. Maybe the teacher forget the mass or he volume value. This is my opinion, but, i would like know your opinion about why its not enogh information and have a more idea for comment it in the class.
 
Also, your temperature conversions need correcting.
 

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