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Why one mole of hydrogen molecules and one mole of H-atoms have different masses?

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Answer:

The number of grammes in a MOLE of any material is the same as the number of atomic mass units (amu). A mole of hydrogen atoms, on the other hand, has a mass of 1 gramme, while a mole of hydrogen molecules has a mass of 2 grammes. Remember that a hydrogen molecule is made up of two hydrogen atoms bound together.

Explanation:

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