Question

Convert 1.0 x 10²¹ molecules of O₂, what is the mass in grams?

Answer 1

0.053 grams O₂

Step-by-step 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