I didn't understand how to solve this question. Like how to bridge the information from the density and atoms etc.

 

I can not see the image.

Ok let me send it again.

Can you see the image now? Just checking...

I can see it

In this question, density and volume is given so you can get mass and number of atoms are also given so you can get moles .
Molar mass is mass / moles.

Oh, ok. Thank you!