SELECT * FROM question_mgmt as q WHERE id=1761 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=56 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry The Solid State a compound forms hexagonal close packed structure

Question:

A compound forms hexagonal close-packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

Answer:

Number of close-packed particles = 0.5 x 6.022 x 1023 = 3.011 x 1023

Therefore, number of octahedral voids = 3.011 x 1023

And, number of tetrahedral voids = 2 x 3.011 x 1023 = 6.022 x 1023

Therefore, total number of voids = 3.011 x 1023 + 6.022 x 1023 = 9.033 x 1023


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