What is the final temperature of the expanding monatomic gas?

  • Thread starter Thread starter ~angel~
  • Start date Start date
  • Tags Tags
    Expanding Gas
Click For Summary

Homework Help Overview

The discussion revolves around a problem involving an ideal monatomic gas undergoing expansion. The original poster presents the scenario with specific values for moles, initial temperature, heat absorbed, and work done, seeking to determine the final temperature of the gas.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between internal energy, heat, and work, with one questioning the calculation of heat (Q) based on provided values. Others suggest using the first law of thermodynamics to relate these quantities.

Discussion Status

The conversation is active, with participants exploring different interpretations of the problem and clarifying the concepts involved. Some guidance has been offered regarding the calculation of internal energy and its relation to temperature, but no consensus has been reached on the final approach.

Contextual Notes

Participants are working under the constraints of the problem as presented, including the use of the ideal gas constant and the properties of monatomic gases. There is an emphasis on understanding the internal energy distribution in ideal gases.

~angel~
Messages
150
Reaction score
0
We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 127C. The gas expands and, in the process, absorbs an amount of heat equal to 1220 J and does an amount of work equal to 2180 J.

I fouind out the change in U, which is -960. I'm just not sure how to calculate Q. Any help would be greatly appreciated.
 
Physics news on Phys.org
~angel~ said:
We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 127C. The gas expands and, in the process, absorbs an amount of heat equal to 1220 J and does an amount of work equal to 2180 J.

I fouind out the change in U, which is -960. I'm just not sure how to calculate Q. Any help would be greatly appreciated.

I don't understand the question. Why isn't Q the heat absorbed that you were given?
 
Sorry, I forgot to ask the question (I just copied and pasted it).

The question is:

What is the final temperature T_final of the gas?
Use R = 8.3145 J/mol/K for the ideal gas constant.
 
Use [itex]Q = \Delta U + W[/itex].
 
~angel~ said:
Sorry, I forgot to ask the question (I just copied and pasted it).

The question is:

What is the final temperature T_final of the gas?
Use R = 8.3145 J/mol/K for the ideal gas constant.

You should be able to calculate the initial internal energy of the gas, given that you know the termperature, how much gas you have, and that it is ideal monatomic. You know how much internal energy was lost in the process, so you know the final internal energy, from which you can calculate the final temperature. Look for the discussion in your text or notes about how internal energy in an ideal gas is distributed.
 

Similar threads

  • · Replies 33 ·
2
Replies
33
Views
3K
Replies
4
Views
2K
  • · Replies 67 ·
3
Replies
67
Views
6K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
5
Views
3K
  • · Replies 12 ·
Replies
12
Views
7K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
3K