Final answer:
To determine the number of atoms in 61.0 grams of calcium, divide the mass by the molar mass to calculate the number of moles. Then, use Avogadro's number to convert moles to atoms.
Step-by-step explanation:
To determine the number of atoms in 61.0 grams of calcium, we need to use the concept of moles. First, we calculate the number of moles of calcium by dividing its mass by its molar mass. The molar mass of calcium is 40.08 g/mol.
Number of moles of calcium = 61.0 g / 40.08 g/mol = 1.524 mol
Since 1 mole contains 6.022 x 10^23 atoms according to Avogadro's number, we can calculate the number of atoms in 61.0 grams of calcium.
Number of atoms = 1.524 mol x (6.022 x 10^23 atoms/mol) = 9.173 x 10^23 atoms