Change in internal engergy of a monatomic ideal gas

  • #1

Homework Statement


A monatomic ideal gas expands from 1.00 meters cubed to 2.50 meters cubed at a constant pressure of 2.00 x 10^5 Pa. Find the change in the internal energy of the gas.



Homework Equations



[tex]\Delta[/tex]U = Q + W

The Attempt at a Solution



Well, I know how to find work, which is -P[tex]\Delta[/tex]V

But I'm having trouble finding the energy transferred into the system by heat, or Q, because the problem does not give a specific value for it.

I would much appreciate it if someone could give me some pointers as to how to find Q.
 

Answers and Replies

  • #2
kuruman
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How is Q related the the specific heat at constant pressure?
 
  • #3
I don't exactly know, I do know that [tex]\Delta[/tex]U = 3/2nR[tex]\Delta[/tex]T for a monatomic gas, where the molar specific heat is given by Cv = 3/2R
 
  • #4
kuruman
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If you know CV, then Cp = CV + R. Also at constant pressure Q = n CpΔT. Now you can put it together.
 
  • #5
Aha, thanks for the help! I got it.
 

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