Page No 21: - Chapter 1 - The Solid State - Intext Solutions - Ncert Solutions class 12 - Chemistry

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Question 1.14:

What is the two dimensional coordination number of a molecule in square close packed layer?

Answer:

In square close-packed layer, a molecule is in contact with four of its neighbours. Therefore, the two-dimensional coordination number of a molecule in square close-packed layer is 4.

Question 1.15:

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 × 6.022 × 10²³ = 3.011 × 10²³

Therefore, number of octahedral voids = 3.011 × 10²³

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

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