How Does Temperature and Volume Affect Gas Pressure?

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Discussion Overview

The discussion revolves around the relationship between temperature, volume, and pressure of a gas, specifically using a sample of hydrogen gas as a case study. Participants explore the application of the combined gas law to solve a problem involving changes in these variables.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a problem involving a hydrogen gas sample and seeks assistance with the calculations related to pressure after changes in volume and temperature.
  • Another participant suggests using the "combined gas law" as a potential solution approach.
  • A third participant references the ideal gas law equation, pV = nRT, and prompts consideration of which variables are held constant in the scenario.
  • A participant confirms their calculations using the combined gas law and shares their results for verification.
  • Subsequent responses affirm the correctness of the calculations presented.

Areas of Agreement / Disagreement

Participants generally agree on the application of the combined gas law and the correctness of the calculations provided, with no significant disagreement noted.

Contextual Notes

Participants assume ideal gas behavior and do not address potential limitations or conditions under which the gas law applies.

Who May Find This Useful

Students or individuals interested in understanding gas laws and their applications in practical scenarios, particularly in chemistry or physics contexts.

PhysicsNoob88
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Question: A sample of hydrogen gas, collected at 100 C and 1.0 atm., has a volume of 350 ml (0.350 lit.). What will be the pressure after it is transferred to a 4.0 lit. flask and cooled to 25 C? (temp must be in degrees of Kelvin)

I had assumed using the formula V2 = P1 X V1 / P2 but i am not getting anything that makes sense. I think its two formulas needed but am not sure. Any assistance would be greatly apperciated
 
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Go to your favorite search engine and type in "combined gas law".

Think that will help.

Best of health.

Steve
 
[tex]pV = nRT[/tex]. Look at the values given. Which ones are being kept constant?
 
Smith4046 said:
Go to your favorite search engine and type in "combined gas law".

Think that will help.

Best of health.

Steve

Thanks! That did the trick alright :biggrin:
 
Can someone verify this is correct?

P1V1/T1 = P2V2/T2
(1.0atm)(.35lit)/(373K) = P(4.0lit)/(298K)
(104.3) = (1492)P
.070atm = P
 
thats correct
 
thanks! just making sure :)
 

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