Question

How many moles of CO molecules weigh 70 g ?​

Answer 1

Answer:

Given :

6.02×10

24

CO molecules

We know,

1 mole CO equivalent to 6.023×10

23

molecules of CO

6.023×10

23

molecules of CO contain 6.023×10

23

atoms of O

Then, 6.02×10

24

CO molecules contain 6.02×10

24

atoms of O

⇒ no. of gram atoms of O=

6.02×10

23

6.02×10

24

=10gm atoms ⟶1

As oxygen is a diatomic molecule.

No. of gm of molecules of oxygen=

2atoms/molecule

10gmatoms

=5gm molecules

Therefore, the correct option is B.