# Question #524f7

Diatomic oxygen is composed out of two oxygen atoms. Each oxygen atom has a molar weight of $16$ $\text{g/mol}$, which means that the ${O}_{2}$ molecule will have a molar weight of $2 \cdot 16 = 32$ $\text{g/mol}$.
One mole is defined as the weight of exactly $6.022 \cdot {10}^{23}$ atoms or molecules, depending on the substance.
1 mole of $O$ has $6.022 \cdot {10}^{23}$ atoms of $O$ and weighs 16 grams.
1 mole of ${O}_{2}$ has $6.022 \cdot {10}^{23}$ molecules of ${O}_{2}$ and weights 32 grams.