Q. 154.4( 51 Votes )
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?
Number of atoms in close packing = 0.5 mol
1 mol has 6.022x1023 particles
Number of close- packed particles = 0.5 × 6.022 × 1023 = 3.011 × 1023
Number of tetrahedral voids = 2 × number of atoms in close packing plug the value we get
Number of tetrahedral voids = 2 × 3.011 × 10 23 = 6.022 × 10 23
Number of octahedral = number of atoms in close packing
Number of octahedral voids = 3.011 × 10 23
Total number of voids = tetrahedral voids + octahedral voids
= 6.022 × 10 23 + 3.011 × 10 23
= 9.03 × 10 23
Rate this question :
Due to hectic and busy schedule, Mr. Angad made his life full of tensions and anxiety. He started taking sleeping pills to overcome the depression without consulting the doctor. Mr. Deepak, a close friend of Mr. Angad, advised him to stop taking sleeping pills and suggested to change his lifestyle by doing Yoga, meditation and some physical exercise. Mr. Angad followed his friend’s advice and after few days he started feeling better.
After reading the above passage, answer the following:
(i) What are the values (at least two) displayed by Mr. Deepak?
(ii) Why is it not advisable to take sleeping pills without consulting doctor?
(iii) What are tranquilizers? Give two examples.Chemistry - Board Papers
Graphite cannot be classified as __________.Chemistry - Exemplar
Which of the following cannot be regarded as molecular solid?Chemistry - Exemplar
Which of the following is a network solid?Chemistry - Exemplar
Ionic solids are hard and brittle.NCERT - Chemistry Part-I
A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3rd of tetrahedral voids. What is the formula of the compound?NCERT - Chemistry Part-I
Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous.
(i) Tetra phosphorus decoxide (P4O10) (vii) Graphite
(ii) Ammonium phosphate (NH4)3PO4 (viii) Brass
(iii) SiC (ix) Rb
(iv) I2 (x) LiBr
(v) P4 (xi) Si
(vi) PlasticNCERT - Chemistry Part-I
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?NCERT - Chemistry Part-I