Explanation:
According to the mole concept, 1 mole of every atom contains [tex]6.022 \times 10^{23}[/tex] atoms.
It is given that mass is 165 g and molar mass of calcium atom is 40.078 g/mol.
Hence, number of moles of calcium atom will be calculated as follows.
No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]
= [tex]\frac{165 g}{40.078 g/mol}[/tex]
= 4.117 mol
Therefore, atoms present in 4.117 mol of calcium are as follows.
[tex]4.117 mol \times 6.022 \times 10^{23}[/tex] atoms/mol.
= [tex]24.792 \times 10^{23}[/tex] atoms
Thus, we can conclude that there are [tex]24.792 \times 10^{23}[/tex] atoms in 165 g of calcium.
