# How does the mole relate to molecules and ions?

Mar 18, 2018

Well, we say that the mole of a substance is equal to $6.02 \cdot {10}^{23}$ of that substance.

#### Explanation:

Scientifically speaking, the mole is equal to the number of atoms in exactly $12 \setminus \text{g}$ of ""^12C, that is carbon-$12$. In chemistry, this is often denoted by a simple $n$.

It is found that approximately $6.02 \cdot {10}^{23}$ atoms of carbon-$12$ will weigh all together $12 \setminus \text{g}$.

So, we say that the mole of something is equal to around $6.02 \cdot {10}^{23}$ of that something, and that's a lot!

Anyways, scientists will often use moles to calculate stoichiometric reactions, in which we can find limiting reactants and percentage yields for example.

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