Binding Energy on DAT?

[MC1255]

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Here I am studying for the DAT using the Kaplan book and it's online materials and I come across a Gen Chem Workshop that talks about Binding Energy?

Haven't heard of calculating it before, here's the equation they give:

BE=change in M(c^2)? Seriously, do we need to know this? 😕

 

[solstice]

I did not know we needed to know this, but this is just Einstein famous equation.
E=mc^2 rest mass energy.
the m is the mass defect which is the energy released after fusion. (when two atoms collide, the nucleus of the formed atom would have less mass than the sum of the masses of it's individual parts and this is the number that goes to m). C is the speed of light 3*10^8 and the E then would be your binding energy that holds the parts together.