Get an idea of the magnitude of binding energy by comparing the energy produced by exploding a hydrogen/oxygen mixture in a balloon with 400 mL hydrogen and 200 mL oxygen (about 0.04 g of hydrogen). Alternatively, soap bubbles with the mixture can be exploded. Caution: No bigger! Loud! Use hearing protectors.
With ΔE ~-125 kJ/g, this will give about 5 kJ. Compare to the binding energy for deuterium:
3.57 x 10-13J/atom x (1 atom / 2.14 amu) x (1 amu / 1.66 x 10-24 g)
= 1.0 x 1011 J/g
From ChemPRIME: 19.12: Mass-Energy Relationships