Answer :

Atomic Weight of Helium, He = 4.0030


Atomic Weight of Hydrogen, H = 1.0080



Atomic Weight of Oxygen, O = 16.0000



a) Difference between Oxygen and Hydrogen = O – H



Difference between Oxygen and Hydrogen is 14.9920


b) Difference between Oxygen and Helium = O – He



Difference between Oxygen and Helium is 11.9970


c) Difference between Helium and Hydrogen = He – H



Difference between Helium and Hydrogen is 2.9950


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