Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: How much heat energy is transferred to or from the gas

  1. Nov 17, 2005 #1
    0.250 mol of a monatomic gas follows the process shown in the figure.
    attachment.php?attachmentid=5591&stc=1&d=1132268995.jpg

    How much heat energy is transferred to or from the gas during process 1 to 2?

    How much heat energy is transferred to or from the gas during process 2 to 3?

    What is the total change in thermal energy of the gas?

    I am not sure how to relate pressure and volume to heat energy.

    I have [tex]pV=nRT[/tex] and [tex]\Delta E_{th}=W+Q[/tex]

    Also for the third question. would I just subtract the energy at point 3 from the energy at
    point 1?
     

    Attached Files:

    Last edited: Nov 17, 2005
  2. jcsd
  3. Nov 17, 2005 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    The change in internal (thermal) energy of the gas is:

    [tex]\Delta U = nC_v\Delta T = \Delta Q + W[/tex] where W is the work done to the gas (use -W if W is the work done by the gas).

    What is [itex]C_v[/itex] for an ideal monatomic gas?

    AM
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook