How many moles of atoms are in each elemental sample?
(a) 4.6 × 1024 Pb atoms
(b) 2.87 × 1022 He atoms
(c) 7.91 × 1023 K atoms
(d) 4.41 × 1021 Ca atoms
Here, we are going to calculate the number of moles of atoms in each of the given elemental sample.
One mole of any species is that quantity in number having a mass equal to its atomic or molecular mass in grams.
The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 1023. This is an experimentally obtained value. This number is called the Avogadro Constant or Avogadro Number.