Why study? It is efficient in grouping these things. As well as because it is hard to combine a single atom to itself and since we work in a macro world, we need to adjust to understand micro things.
The standard scientific unit for measuring large quantities or very small particles/entities: 1 mole = 6.02 x 10^23 particles
Amedeo Avogrado discovered about moles.
To find the particles, put the conversion factor on top.
To find the moles, put the conversion factor below.
Always round off based on the significant figures of the given.
