1. Not finding help here? Sign up for a free 30min 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!

First law of thermodynamics and work done

  1. May 31, 2009 #1
    Two kilograms of water at 100oC is converted to steam at 1 ATM. Find the work done (in J). (The density of steam at 100oC is 0.598 kg/m3.)

    a. 4.6 x 104
    b. 3.4 x 104
    c. 1.2 x 105
    d. 2.1 x 104
    e. 3.4 x 105

    I'ved use the integration holding volume as a variable. However, I dont know why im not getting the right answer.
     
  2. jcsd
  3. Jun 1, 2009 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    You don't have to do an integration. Assume that the change in volume from water to steam occurs at 1 Atm external pressure and that the steam is created gradually. Pressure is constant, so [itex]W = \int PdV = PV[/itex] (assume initial volume is 0).

    AM

    PS Welcome to PF, btw.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: First law of thermodynamics and work done
Loading...