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Work under constant temperature

  • Thread starter ymehuuh
  • Start date
  • #1
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Homework Statement



An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 780 K. If the initial pressure is 1.20x10^5 Pa.
(a) Find the work done on the gas.
(b) Find the thermal energy transfer Q.
(c) Find the change in the internal energy.

Homework Equations


W= -PV
deltaU=Q-W
PfVf/PiVi = Tf/Ti


The Attempt at a Solution



I know I need to find the final pressure...but I'm not sure how to.
Do I use Pf*1.35/1.2x10^5 = 780k?
 

Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
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Homework Statement



An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 780 K. If the initial pressure is 1.20x10^5 Pa.
(a) Find the work done on the gas.
If T is constant and PV=nRT, what is the relationship between P1V1 and P2V2? Does that help you to find P2?

AM
 

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