Question

number of moles of o2 molecules in 64 gms of o2 is

Answer 1

Molecular mass of O₂ = 2 x 16 = 32 grams

Number of moles of O₂ = given mass/molecular mass

= 64/32 = 2 moles

Hope it helps!!

Answer 2

number of moles=given mass÷molar mass
=64÷32
=2