Answer:
12.04 × 10²³ atoms
Step-by-step explanation:
Given data:
Mass of cobalt = 117.86 g
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
Number of moles of cobalt = 117.86 g/ 58.9 g/mol
Number of moles of cobalt = 2 mol
one moles of cobalt = 6.022 × 10²³ atoms of cobalt
2 moles × 6.022 × 10²³ atoms / 1 mol
12.04 × 10²³ atoms