Answer:
0.053 grams O₂
Explanation:
To find the mass of O₂, you need to convert the number of molecules to moles (using Avogadro's number) then convert the number of moles to mass (using the molar mass from the periodic table).
6.022 x 10²³ molecules = 1 mole
Molar Mass (O₂) = 2(16.00) g/mol
Molar Mass (O₂) = 32.00 g/mol
1.0 x 10²¹ molecules O₂ 1 mole 32.00 grams
----------------------------------- x ------------------------------------ x ----------------------
6.022 x 10²³ molecules 1 mole
= 0.053 grams O₂
