Question

Calculate the number of molecules in 8 g of oxygen molecule (atomic mass of oxygen is 16u)

Answer 1

Explanation:

No. of moles in 8g of oxygen atom

n=

M

m

×N

A

⇒

16

8

×6.02×10

23

=3.01×10

23

moles

ii) 6.02×10

23

atoms contains 1 mole

Then, 4.088×10

21

atom contains =

6.02×10

23

4.088×10

21

=0.67×10

−2

moles.