One mole of O2 gas (oxygen molecule) contains Avogadro's number of molecules, which is approximately
6.022
×
1
0
23
6.022×10
23
molecules/mol. Since each molecule of O2 consists of two oxygen atoms, you can multiply Avogadro's number by 2 to find the number of oxygen atoms in one mole of O2.
Number of oxygen atoms
=
2
×
Avogadro’s number
Number of oxygen atoms=2×Avogadro’s number
Number of oxygen atoms
=
2
×
(
6.022
×
1
0
23
)
Number of oxygen atoms=2×(6.022×10
23
)
Number of oxygen atoms
≈
1.204
×
1
0
24
Number of oxygen atoms≈1.204×10
24
Therefore, 1 mole of O2 gas contains approximately
1.204
×
1
0
24
1.204×10
24
oxygen atoms.