Question

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NUMERICALS
Unit 1.Solid state :

1. Calculate the packing efficiency in a unit cell of cubic close packing
structure.

2. Calculate the packing efficiency in Body centered cubic (BCC) lattice


3. An element having atomic mass 107.9 g/mol has fcc unit cell. The ed
of unit cell is 408.6pm. Calculate the density of the unit cell. io
Na=6.022x 10²³mol-')

4. Calculate the number of atoms present in FCC crystal

5. Calculate the Packing efficiency in a simple cubic lattice.

6. Copper crystallizes into an fcc lattice with edge length 3.61x10 to the power minus 8 cm Show
the calculated density is in agreement with its measured value
8.92gcm³

7. Sodium metal crystallizes in a BCC structure. Its unit cell edge lens
420pm. Calculate the density. (atomic mass of sodium=23u, Na=6.022x1023 per mol)

8. Gold with atomic radius 0.144 nm crystallises in fcc form. What is the ed
length of the unit cell?

9. An element having atomic mass 60 has fcc lattice, the edge length of unit call is 400 pm. Calculate the density of the crystal. [Given Na=6.022x10 ²³]

10. An element having atomic mass 63.1g/mol has fcc lattice, the edge length of
unit cell is 3.608 x 10 to the power minus 8 cm. Calculate the density of unit cell. Given [Na=6.022x10²³]

11. Lithium metal has a body centered cubic lattice structure with edge length of
unit cell 352 pm. .Calculate the density of lithium metal. [given atomic mass of Li= 7 g/mol, Na = 6.022 x 10²³ atoms/mol]

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Answer 1

Answer:

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