Answer:
When doing reactions chemists need to count atoms and molecules. The problem of actually counting individual atoms and molecules comes from the fact that they are so small. Instead of physically counting each one we can measure the mass of a large group of them
The mole is important because it allows chemists to work with the subatomic world with macro world units and amounts. ... A mole of something represents 6.022x1023 items. Whether it be atom, molecule or formula unit. Defining the mole in this way allows you change grams to moles or moles to particles.
