What is the mass in grams of a sample of 1.20 x 10 22 atoms of mercury?

The number of moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 * 10²³] (which is used as a standard in the world of moles).

Now,

if 6.02 * 10²³ atoms are found in 1 mole of mecury

then let 1.20 * 10²² atoms are found in x

⇒ x = (1.20 * 10²²) : (6.02 * 10²³)

= 0.0199 moles

Now, mass = moles * molar mass

∴ mass of Hg = 0.0199 mol * 201 g/mol

= 4.001 g

∴ T he mass in grams of a sample of 1.20 x 10 ²² atoms of mercury is ~ 4 g

4.0g Hg. I may be wrong and I really don't remember how to do it so I am not going to tell you my work, but I tried because I never did good on the chapter in chem.