The density of KBr is 2.75 g cm^–3. The length of the edge of the unit cell is 654 pm. Show that KBr has a fcc structure.

Solution

we know that

$d = \frac{ZM}{a^{3} N_{A}}$

as given that,
density= 2.75 g cm^–3
a = 654 pm or a³ = 2.79 x 10^-23
mass of KBr is 119 gram

$Z = \frac{2.75 x 6.54 x 10^{- 23} x 6.022 x 10^{23}}{119} = 4$

Some More Questions From The Solid State Chapter

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The Solid State

The density of KBr is 2.75 g cm^–3. The length of the edge of the unit cell is 654 pm. Show that KBr has a fcc structure.

Some More Questions From The Solid State Chapter

Why are solids rigid?

Why do solids have a definite volume?

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Why is glass considred a super-cooled liquid?

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

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NCERT Sample Papers

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For Daily Free Study Material Join wiredfaculty

The Solid State

The density of KBr is 2.75 g cm–3. The length of the edge of the unit cell is 654 pm. Show that KBr has a fcc structure.

Some More Questions From The Solid State Chapter

Why are solids rigid?

Why do solids have a definite volume?

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Why is glass considred a super-cooled liquid?

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

Classify the following solids in different categories based on the nature of intermolecular forces operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphate, graphite, rubidium, argon, silicon carbide.

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

The density of KBr is 2.75 g cm^–3. The length of the edge of the unit cell is 654 pm. Show that KBr has a fcc structure.

Classify the following solids in different categories based on the nature of intermolecular forces operating in them:
Potassium sulphate, tin, benzene, urea, ammonia, water, zinc
sulphate, graphite, rubidium, argon, silicon carbide.