How many calcium atoms would be in a 100 g sample of calcium

The number of calcium atoms that would be in a 100 g sample of calcium is 1.505 x 10²⁴ atoms

calculation

Step 1; find the moles of calcium

moles = mass: molar mass

from periodic table the molar mass of Ca = 40 g/mol

moles is therefore = 100 g: 40 g/mol = 2.5 moles

Step 2: use the Avogadro's law constant to determine the number of atoms of Calcium

That is According Avogadro's law 1 mole = 6.02 * 10²³ atoms

2.5 moles=? atoms

{ (2.5 moles * 6.02*10²³ atoms) / 1 mole} = 1.505 * 10²⁴ atoms