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From Yahoo Answers. Question: The mole concept is important in chemistry because 1. atoms and molecules are very small and themole concept allows us to count atoms and molecules by weighing macroscopic amounts of material. 2. it establishes a standard for reaction stoi-chiometry. 3. it explains the properties of gases.
The molar mass is also an important conversion factor to convert moles to grams. To do this, we multiply the number of moles of the substance to the molar mass.