How many atoms are there in 5.7 mol of hafnium?

There are in 5.7 mol of hafnium.

Explanation:

Moles of hafnium = 5,7 moles

1 mol =

Number of atoms in 5.7 moles of hafnium :

There are in 5.7 mol of hafnium.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

58750.08068 is the answer i think