How many oxgyen atoms does 1 mol of O2 gas have?

One mole of O₂ gas contains 2 moles of oxygen atoms since each molecule of O₂ consists of two oxygen atoms. Using Avogadro's number, which is approximately (6.022 \times 10^{23}) entities per mole, 1 mole of O₂ gas contains about (2 \times 6.022 \times 10^{23} \approx 1.2044 \times 10^{24}) oxygen atoms.