Mass Defect (1 Viewer)

[Jellymonsta]

Ok i am really shaky on this...
I know the defect becomes the binding energy, but how do you actually determine the mass defect in a nuclear equation?
eg
2H + 2H --> 4He
1___1____ 2
I have an answer but i cant see how to get it

 

[BlackJack]

Add up the mass on the left hand side...
2* mass of Deuterium
and compare to the right hand side...
mass of helium
The difference in mass (He will be lighter) is the mass converted to binding energy. Multiply by that 931.5 value I think...

 

[Jellymonsta]

so whats the mass of deuterium (compared to helium's 1.00778 u)? its 2.01645 u isnt it? because thats what i got, but the answer provided is lieing to me :mad1:

 

[BlackJack]

Wait... mass of helium is 4.something/it's got 2 ps and 2 ns each at least 1

 

[Jellymonsta]

woops meant hydrogen

 

[McLake]

Youll be given it (hopefully ...)