Question

A compound forms hexagonal close packed structure what is total no. of voids in 0.5mol of it

Answer 1

hhhPut a metal spoon in some boiling water for thirty minutes and then try to take it out with your bare hands.

No seriously, don’t do it, you’ll probably get a nasty burn. The simple reason is that metal is a very good conductor of heat and would soak up the heat from a frying pan, boiling water, hot oil etc like a sponge

Answer 2

Answer :-

In a hcp arrangement,

Let the number of close packed sphere = N

The total No. of octahedral voids generated = N

No. of atoms in one mole of the unit cell =

$6.022 \times {10}^{23}$

No. of octahedral voids in 0.5 mol =

$\frac{6.022 \times {10}^{23} }{2} \\ = 3.011 \times {10}^{23}$

____________________✍

Because, No. of tetrahedral voids is twice the number of octahedral voids.

No. of tetrahedral voids =

$2 \times 3.011 \times {10}^{23}$

____________________✍

Total No. of voids in the compound = No. of octahedral voids + No. of tetrahedral voids

$= 3.011 \times {10}^{23} + 6.022 \times {10}^{23}$

$= 9.033 \times {10}^{23}$

Hope it helps !