Iron oxide FeO, crystallises in a cubic lattice with a unit cell edge length of 5.0 Å. If density of the FeO in the crystal is 4.0 g cm–3, then the number of FeO units present per unit cell is ……… . (

Question

Iron oxide FeO, crystallises in a cubic lattice with a unit cell edge length of 5.0 Å. If density of the FeO in the crystal is 4.0 g cm–3, then the number of FeO units present per unit cell is ……… . (Nearest integer) (Given: Molar mass of Fe and O is 56 and 16 g mol–1 respectively. NA = 6.0 × 1023 mol–1

Prashant Kotian · Accepted Answer

Correct answer: .. d = V N M Z A   4 = 8 ] 5 [ 6 Z      4 = 10 6 Z     Z = 72 6    Z = 4

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