Determine the mass of 5.82 x1023 atoms CI. Answer in units of g.

Question

Determine the mass of 5.82 x1023

atoms

CI.

Answer in units of g.

Answer 1

I am going to assume you mean 5.82 x 10^23 atoms.

The atomic mass of Cl is 35.453 g/mol. This means that one mol (6.022 x 10^23 atoms) of Cl has a mass of 35.453 grams. We do not have a full mol, so we will find what percentage of a mol we do have.

(5.82 x 10^23 atoms) / (6.022 x 10^23 atoms) = 0.966 or 96.6%

It stands to reason that our mass with be the same percentage off from the atomic mass

(35.453 grams) x 0.966 = 34.2 grams <--- Final Answer

Answer 2

One mole of Cl contains 6.022 x 10^23 atoms (Avogadro's number).

1 mole / 6.022 x 10^23 atoms x 5.82 x 10^23 atoms = 0.966 moles of Cl.

35.45 g Cl / mole x 0.966 moles = 34.2 g Cl.