Determine the mass of 5.33x10^23 atoms Cl. Answer in grams.

Question

Determine the mass of 5.33x10^23 atoms Cl. Answer in grams.

Answer 1

Divide by Avogadro's number to find the number of moles, then multiply the number of moles by the atomic weight of Cl to get the mass.

 

Number of moles = (5.33 x 10²³ atoms) / (6.02 x 10²³ atoms per mole) = 0.8854 moles

 

Atomic weight of Cl (from tables) = 35.45 g/mole

 

Mass = (0.8854 moles)(35.45 g/mole) ≅ 31.4 g