Question

"how many atoms are in 169 g of calcium"

Answer 1

First calculate the number of moles. Molar mass of Calcium = 40.08 g/mol

 

Number of moles = 169 g / (40.08 g / mol) = 4.217 moles

 

Using Avogadros number, we can get the number of atoms:

Number of atoms = 4.217 moles * (6.022 x 10^23 atoms / moles) = 2.54 x 10^24 atoms