The binding energy of the deuterium is 2.23 MeV. The mass defect in amu is

CONCEPT:

• Binding Energy: The energy needed to break a nucleus into its constituent protons and neutrons.
• Binding energy per nucleon (BEN): Energy needs to remove a nucleon from a nucleus.
• Mass defect: Difference between the mass of a nucleus and the total mass of its constituent nucleons.

Binding Energy (B) = Δm × 931 MeV 

​Where Δm = mass defect.

CALCULATION:

Given - Binding Energy (B) = 2.23 MeV

The mass defect in amu is

⇒ B = Δm × 931 MeV