Question

Iron (II) oxide has a cubic structure and each unit cell has side 5 Å. If the density of the oxide is `4 g cm^(-3)`, calculate the number of `Fe^(2+)` and `O^(2-)` ions present in each unit cell (Molar mass of FeO=`72 g mol^(-1)`, `N_A=6.02xx10^23 "mol"^(-1)`)

Answer 1

Correct Answer - Z=4, i.e., `4 Fe^(2+)` and `4 O^(2-)` ion