Solve Gas Law Problem: Stuck, Need Help

  • Thread starter Thread starter apchemstudent
  • Start date Start date
  • Tags Tags
    Gas Gas law Law
Click For Summary

Discussion Overview

The discussion revolves around solving a gas law problem involving changes in pressure, volume, and the presence of water vapor. Participants are attempting to apply relevant gas laws and principles to arrive at a solution, but some express uncertainty and confusion regarding the calculations and concepts involved.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant notes difficulty in reaching any of the provided answer choices, sharing their calculations involving temperature, pressure, and volume changes.
  • Another participant asks for guidance on how to solve the problem, indicating a need for further clarification.
  • A participant points out that pressure and volume are not directly proportional, suggesting this might be relevant to the problem.
  • Another participant references Avogadro's law, stating that volume percent is equivalent to mole percentage and that mole percentage relates to pressure percentage according to Dalton's law of partial pressures. They express uncertainty about the relevance of molecular weight in the context of the problem.
  • This participant also shares a calculation that leads to a result of one percent, but they remain unsure about the implications of the molecular weight information provided in the problem.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct approach to solving the problem, with multiple viewpoints and calculations presented. Uncertainty remains regarding the application of gas laws and the significance of certain data provided in the problem.

Contextual Notes

Some assumptions regarding the relationships between pressure, volume, and temperature may not be fully articulated. The relevance of molecular weight in the context of the gas laws is also questioned but not resolved.

apchemstudent
Messages
220
Reaction score
0
I don't seem to be able to get close to any of the choices given.

Here's my work: 288 K = T
P = 101.23 kPa

2% volume = water vapor

Well the next day the pressure changes to 100.47 kPa at the same temperature. The volume changes by 101.23/100.47 = 1.008...

I'm stuck here... Can some one help? Thanks
 

Attachments

  • Gas Law question.jpg
    Gas Law question.jpg
    24.4 KB · Views: 438
Last edited:
Chemistry news on Phys.org
any idea on how to solve this problem?
 
apchemstudent said:
...

Well the next day the pressure changes to 100.47 kPa at the same temperature. The volume changes by 101.23/100.47 = 1.008...

...


pressure and volume are not directly proportional... perhaps this helps?
 
by avogadro's law the volume percent is equivalent to the mole percentage. In addition the mole percentage is equal to the pressure percentage (by dalton's law of partial pressures). Keep this in mind for the rest of this post.

I got one percent.
[tex][100.47-(101.23-.02(101.23))]/100.47[/tex]

I'm still not quite sure why they gave the molecular weight of gases in the problem, PV=nRT does not depend on mass composition. It's a colligative property

Once you find the final answer, please be considerate enough to tell the rest of us.
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
3K
Replies
14
Views
4K
  • · Replies 14 ·
Replies
14
Views
5K
  • · Replies 2 ·
Replies
2
Views
4K
Replies
3
Views
3K
  • · Replies 8 ·
Replies
8
Views
3K
Replies
5
Views
3K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 1 ·
Replies
1
Views
366
  • · Replies 6 ·
Replies
6
Views
3K