1.

Copper crystallizes in a face centred cubic lattice. Calculate the number of unit cells in 1.2g of copper. Atomic mass of copper = 63.54.

Answer»


Solution :NUMBER of CU atoms in 63.54 g Cu=`6.023 XX 10^(23)`
Number of atoms in 1.2 g Cu = `(6.023 xx 10^(23) xx 1.2)/(63.54) = 11.375 xx 10^(21)` atoms
Number of atoms in a face centred cubic lattice = 4
`:.` Number of unit CELLS in 1.2g
Cu = `(11.375 xx 10^(21))/(4)= 2.84 xx 10^(21)`


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