# I have a question about fusion

## Main Question or Discussion Point

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/

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Meir Achuz
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
$^2 H + ^3 H \rightarrow ^4 He + n.$
That is deutron + tritium --> helium + neutron.
If you want, I can calculate one mole of d on one mole of t.

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

Daniel.

Meir Achuz
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.

Meir Achuz
Homework Helper
Gold Member
dextercioby: You can't conserve both energy and momentum in d+d--> He.

Astronuc
Staff Emeritus