To determine the number of atoms in a given amount of a substance, you need to use Avogadro's number, which is approximately 6.022 × 10^23 atoms/mol.
First, you need to determine the number of moles of oxygen in 16 grams. The molar mass of oxygen (O) is approximately 16 grams/mol. Therefore, 16 grams of oxygen is equal to 1 mole of oxygen.
Now, using Avogadro's number, we can determine the number of atoms in 1 mole of oxygen:
1 mole of oxygen = 6.022 × 10^23 atoms
Since 16 grams of oxygen is equal to 1 mole, the number of atoms in 16 grams of oxygen will also be 6.022 × 10^23 atoms.
Thus, there are approximately 6.022 × 10^23 atoms in 16 grams of oxygen.