• Support PF! Buy your school textbooks, materials and every day products Here!

Average Kinetic Energy of Gas

  • #1

Homework Statement



Calculate the kinetic energy of CO, CO2, and SO3 at 276 K .

Homework Equations



KE = (3/2) RT
KE= (1/2)(mass)(velocity)^2

The Attempt at a Solution


[/B]
For CO:
First attempt: KE=(3/2)(RT)=(3/2)(8.314 J/mol-K)(276K) = 3441.996 -- So that's wrong
Second attempt:
Relative Molecular Mass of CO= 28
6.02x10^23 molecules of CO= 28g
1 molecule of CO= 28/6.02x10^23
4.65x10^-23g
4.65x10^-26kg

Kinetic energy of CO= 1/2(4.65x10^-26)(490^2)
= 5.58x10^-21 J -- according to mastering this is also wrong


Thank You
 

Answers and Replies

  • #2
Ygggdrasil
Science Advisor
Insights Author
Gold Member
2019 Award
2,999
2,453
KE = (3/2) RT
I believe this equation applies only to monatomic ideal gases. For molecules, such as CO, CO2, and SO3, you need to calculate the number of degrees of freedom for each of these molecules.
 

Related Threads on Average Kinetic Energy of Gas

Replies
1
Views
15K
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
17
Views
4K
Replies
18
Views
9K
Replies
7
Views
3K
  • Last Post
Replies
2
Views
5K
Replies
3
Views
4K
Top