How many moles does 3O2 have?

To find the number of moles in 3 O₂ molecules, you can use Avogadro's number, which states that one mole of any substance contains approximately (6.022 \times 10^{23}) entities (atoms, molecules, etc.). Since (1) mole of O₂ corresponds to (6.022 \times 10^{23}) O₂ molecules, the number of moles in (3) O₂ molecules is calculated as (3 \div 6.022 \times 10^{23}), which equals approximately (4.97 \times 10^{-24}) moles.