How many atoms are in 193 g of calcium?

To find the number of atoms in 193 g of calcium, first determine the number of moles of calcium using its molar mass, which is approximately 40.08 g/mol. Dividing 193 g by 40.08 g/mol gives about 4.81 moles of calcium. Since one mole contains approximately (6.022 \times 10^{23}) atoms (Avogadro's number), multiplying 4.81 moles by (6.022 \times 10^{23}) atoms/mole results in about (2.89 \times 10^{24}) atoms of calcium.