The mole... in all it's glory

The mole was surprisingly simple. As a quantity, and as a concept, it being the number of atoms in of an element when its atomic mass is in grams. Although I am still figuring out it's application, the concept itself seems solid and was thoroughly reinforced by our current lab. Percent composition is a concept thoroughly well reviewed from basic math. I liked how the empirical formula and the molecular formula are so related. One gives the other, its really cool.