# What is meant by the "mole"? How is it useful in chemical calculations?

Mar 7, 2016

If I have a mole of stuff, there are $6.022 \times {10}^{23}$ individual items of that stuff.
So if you have a dozen eggs, there are $\frac{12 \cdot e g g s}{6.022 \times {10}^{23} \cdot e g g s \cdot m o {l}^{-} 1}$. Now obviously this is a ridiculously small number, and of no use to any calculation.
However, if I have gram quantities of elements or compounds, this is a useful exercise, because in $12.00 \cdot g$ ""^12C there are $6.022 \times {10}^{23}$ ""^12C atoms, $\text{1 mole}$ of ""^12C atoms. I could repeat these elemental molar masses for every element in the Periodic Table, and you will always have access to one of these in every test in Chemistry and Physics you ever sit.