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In her science class, Jyoti learned that...

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030, of Hydrogen is 1.0080, and of Oxygen is 16.0000. Find the difference between the atomic weights of:
(a) Oxygen and Hydrogen
(b) Oxygen and Helium
(c) Helium and Hydrogen

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