Helpp with thermodynamics and specific heat question!

  • Thread starter TheTourist
  • Start date
  • #1
25
0
For an ideal monatomic gas, the molar specific heat at constant volume,
Cv=3/2R, where R is the gas constant. The heat capacity at constant volume of a gas is measured to be 43.58kJK-1. How many kg-moles of the gas are present?




Iv tried looking in the lecture notes and in the textbook, but cant find anything of use.

Iv made an attempt and got 3.5kg-moles. Not sure that its right though. I used R=kNA, where k is Boltzmann constant and NA is Avogadros number.
 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
7,626
364
For an ideal monatomic gas, the molar specific heat at constant volume,
Cv=3/2R, where R is the gas constant. The heat capacity at constant volume of a gas is measured to be 43.58kJK-1. How many kg-moles of the gas are present?




Iv tried looking in the lecture notes and in the textbook, but cant find anything of use.

Iv made an attempt and got 3.5kg-moles. Not sure that its right though. I used R=kNA, where k is Boltzmann constant and NA is Avogadros number.
The heat capacity of n moles is n times the molar heat capacity.

The heat capacity of one mole of gas at constant volume is that amount heat flow required to raise the temperature one degree:

[tex]C_v = Q/\Delta T[/tex]

If there are n moles, multiply both sides by n to determine the amount of heat flow per degree of temperature change.

AM
 

Related Threads on Helpp with thermodynamics and specific heat question!

Replies
1
Views
6K
  • Last Post
Replies
2
Views
1K
Replies
6
Views
183
Replies
7
Views
867
Replies
2
Views
129
Replies
1
Views
2K
Replies
3
Views
1K
  • Last Post
Replies
7
Views
11K
  • Last Post
Replies
2
Views
616
Replies
1
Views
1K
Top