Questions on Ideal Gas Homework: Solving for Pressure

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Discussion Overview

The discussion revolves around a homework problem related to the ideal gas law, specifically focusing on solving for pressure given certain parameters. Participants explore unit conversions and address a separate question regarding the mass of nitrogen at standard temperature and pressure.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant presents a homework problem involving the ideal gas law and expresses confusion about unit cancellation when calculating pressure.
  • Another participant suggests using a specific value for the gas constant R and provides a conversion from atm to Pa.
  • A correction is made regarding the conversion factor for atm to Pa, with a clarification on the correct numerical value.
  • Another participant acknowledges a misunderstanding about the units and thanks those who provided corrections.
  • A separate participant introduces a new question about the mass of nitrogen in a cylinder under different conditions, which appears unrelated to the original problem.
  • Some participants question the appropriateness of posting the new question in the current thread.

Areas of Agreement / Disagreement

There is some agreement on the conversion factors for pressure, but confusion remains regarding the original problem's unit cancellation. The introduction of a new question leads to a lack of consensus on whether it belongs in the same thread.

Contextual Notes

The discussion includes unresolved issues regarding unit conversions and the proper application of the ideal gas law. The new question about nitrogen introduces additional complexity without clear connections to the original topic.

Who May Find This Useful

Students working on ideal gas law problems, particularly those struggling with unit conversions and pressure calculations, as well as those interested in related gas behavior under varying conditions.

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Homework Statement


Unknown: Pressure

Given:
V: 0.002 L
n: 0.019 mol
R: 8.31 (uh..any units here..?)
T: 498 K

Homework Equations


PV= nRT

The Attempt at a Solution


For some reason, the units don't cancel out when I attempt to reach the solution when I try to get the Pressure. So what are the proper units that I need to get a proper answer? I know the answer should be in kPa, but the "K, mol, L" units don't cancel out...Help~
 
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with the given units you need to use

R=0.082058 L*atm*mol-1*K-1

and convert atm to Pa where

1 atm = 101325 Pa
 
Last edited:
small correction

You forgot the period between the 1 and the 3 :P
So its really 101.325 Pa

bob1182006 I'm sure you already knew this, but I'm mainly saying it so Live_4Ever! won't get confused.
 
Not so! Bob has the conversion correct, 1 atm is about 1e5 Pa.
 
Oh woops~

Sorry, i misread the units that were used...i thought it said KPa. Thanks for the correction marcusl, and sorry about that bob1182006 :biggrin:
 
Hi every1 there
I've a qtn troubling me !
A cylinder contains 2.0kg og Nitrogen at a pressure of 3.0x10^6 Pa and a temperature of 17 degrees ! What mass of nitrogen would a cylinder of the same mass contain at standard temperature and pressure?
 
shouldn't you have posted this in your own thread?
 
Avi1794 said:
Hi every1 there
I've a qtn troubling me !
A cylinder contains 2.0kg og Nitrogen at a pressure of 3.0x10^6 Pa and a temperature of 17 degrees ! What mass of nitrogen would a cylinder of the same mass contain at standard temperature and pressure?

If I have 25 apples, how many apples would I have if I have the same number of apples as that?
 

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