1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Work under constant temperature

  1. May 6, 2009 #1
    1. The problem statement, all variables and given/known data

    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.

    2. Relevant equations
    W= -PV
    deltaU=Q-W
    PfVf/PiVi = Tf/Ti


    3. 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?
     
  2. jcsd
  3. May 6, 2009 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    If T is constant and PV=nRT, what is the relationship between P1V1 and P2V2? Does that help you to find P2?

    AM
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook