What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

Mass Cu:

7.3g * 86% = 6.278g is the mass of Cu.

Moles Cu:

6.278g * (1mol / 63.546g) = 0.099moles Cu

Atoms Cu:

0.099moles Cu * (6.022x10²³atoms / 1mol) =

fe 55.85 g/mol and h2o 18.02 g/mol.