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

I have a question about fusion

  1. Apr 6, 2005 #1
    So here it is:

    What is the energy released when one mole of deterium(?) undergoes complete fusion? Oh, here's the equation:

    H + H = He

    i dunno how to post but its 2,1 for both hydrogen isotopes and then 4,2 for the helium duh i know but i dont want confusion.

    cheers ro><ors!


    http://billnye.ytmnd.com/
     
  2. jcsd
  3. Apr 6, 2005 #2

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Fusion can't go that way because there is nowhere for the energy to go.
    The most common fusion process is
    [itex]^2 H + ^3 H \rightarrow ^4 He + n.[/itex]
    That is deutron + tritium --> helium + neutron.
    If you want, I can calculate one mole of d on one mole of t.
     
  4. Apr 6, 2005 #3

    dextercioby

    User Avatar
    Science Advisor
    Homework Helper

    U mean 2 nuclei of deuterium can't fuse into an alpha particle...? What laws of physics forbid that?

    Daniel.
     
  5. Apr 6, 2005 #4

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Billnye: The mass difference between d+t and He + n is 17.59 MeV.
    Multiplying this by Avagadro's number (for one mole), and converting to Joules,
    I get (Check my arithmetic.) 1.7 X 10^12 Joules released.
    I guess that would be written as 1.7 tJ. That's more than I make in a year.
     
  6. Apr 6, 2005 #5

    Meir Achuz

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    dextercioby: You can't conserve both energy and momentum in d+d--> He.
     
  7. Apr 7, 2005 #6

    Astronuc

    User Avatar

    Staff: Mentor

    d + d --> 3He + n + 3.25 MeV (~50%)

    d + d --> t + p + 4.0 MeV (~50%)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: I have a question about fusion
  1. I Have A Question! (Replies: 1)

Loading...