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Answer:

Avogadro proposed that equal volumes of gases under the same conditions contain the same number of molecules, and hypothesis that proved useful in determining atomic and molecular weights and which led to the concept of mole.

Explanation:

StinkyGarbage1

"The mole is important because it allows chemists to work with the subatomic world with macro world units and amounts. Atoms, molecules and formula units are very small and very difficult to work with usually. However, the mole allows a chemist to work with amounts large enough to use."

- Source socratic.org

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