Change in internal energy in air

  • Thread starter S1CkFiSh
  • Start date
  • #1
22
0
If we apply 300 kJ of heat to 2500 moles of air at constant pressure, what is the change in internal energy?

So far i think I use the equation: (f/x)nkT, but I don't know how to calculate the degrees of freedom and whether I do or not, and whether or not to calculate the number of moles by n=2500/6.022 x 10^23 (avogadro's constant), or if I just plug 2500 moles into n?
 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
7,691
403
If we apply 300 kJ of heat to 2500 moles of air at constant pressure, what is the change in internal energy?

So far i think I use the equation: (f/x)nkT, but I don't know how to calculate the degrees of freedom and whether I do or not, and whether or not to calculate the number of moles by n=2500/6.022 x 10^23 (avogadro's constant), or if I just plug 2500 moles into n?
Look up the Cp for air. It consists mainly of diatomic molecules (N2, O2), if you want to figure it out.

AM
 
  • #3
22
0
ok, thank you very much its appreciated
 

Related Threads on Change in internal energy in air

  • Last Post
Replies
2
Views
8K
  • Last Post
Replies
6
Views
10K
  • Last Post
Replies
2
Views
4K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
2
Views
1K
Replies
5
Views
2K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
3
Views
310
  • Last Post
Replies
2
Views
3K
Top