Number of moles in 20 g of Calcium: n = m/M n = 20 g / 40.08 g/mol n = 0.499 moles
Number of atoms in 0.499 moles of Calcium: 1 mole of Calcium contains 6.022 x 10^23 atoms 0.499 moles contain = 0.499 x 6.022 x 10^23 atoms = 3.005 x 10^23 atoms
Therefore, there are 3.005 x 10^23 atoms of Calcium in 20 g of metallic Calcium.
Molar mass of Calcium (Ca) = 40.08 g/mol
Number of moles in 20 g of Calcium:
n = m/M
n = 20 g / 40.08 g/mol
n = 0.499 moles
Number of atoms in 0.499 moles of Calcium:
1 mole of Calcium contains 6.022 x 10^23 atoms
0.499 moles contain = 0.499 x 6.022 x 10^23 atoms
= 3.005 x 10^23 atoms
Therefore, there are 3.005 x 10^23 atoms of Calcium in 20 g of metallic Calcium.