Put values in formula (1) to find the mass defect.

Δm = {2(1.6726 × 10^{-27}) + 2(1.6749 × 10^{-27})} – 6.6447 × 10^{-27}

Δm = (3.3452 + 3.3498) ×10^{-27} – 6.6447 × 10^{-27} = 0.0503 × 10^{-27} kg …… (3)

Now 1.660 × 10^{-27} kg = 1 amu

OR 1 kg = (1/1.660) × 10^{27} amu = 0.602409 × 10^{27} amu

Multiply by the value of Δm from equation (3) on both sides.

0.0503 × 10^{-27} kg = 0.0503 × 0.602409 amu = 0.0303 amu

Since 1 amu = 931.5 MeV, therefore,

0.0303 amu = .0303 × 931.5 =** 28.224 MeV**

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