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CBSE Class 12-science Answered

In chromium (III) chloride, CrCl3, the chloride ions have CCP (cubic close packing) arrangement and Cr (III) ions are present in octahedral holes. What fraction of the octahedral holes is occupied? What fraction of the total number of holes is occupied? 
Asked by Topperlearning User | 17 Jun, 2016, 10:50: AM
answered-by-expert Expert Answer

In CCP arrangement each chloride ion would have one octahedral void and two tetrahedral void associated with it.

Number of octahedral voids with 3 chloride ions = 3
Number of tetrahedral voids with 3 chloride ions = 3 x 2 = 6
Total number of voids with 3 chloride ions = 9
Number of octahedral voids occupied by Cr (III) = 1
Fraction of octahedral voids occupied = begin mathsize 10px style 1 third end style
Fraction of total number of voids occupied = begin mathsize 10px style 1 over 9 end style
Answered by | 17 Jun, 2016, 12:50: PM

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