Question

calculate the mass of a unit cell of copper crystals?​

Answer 1

Answer:

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Explanation:

The weight of one mole of a substance is equal to its atomic mass in grams , therefore

1 mole of Al =27g of Aluminium

Also , 1 mole contains Avogadro number of atoms :-1mole=6.023×10²³ atoms of Aluminium

Therefore , 1 mole of Al - 27 g of aluminium - 6.023×10²³ atoms of aluminium

Number of atoms in 8.1g aluminium is =(8.1×6.023×10²³)/27

The face centered cubic structure contains 4 atoms in one unit cell .

Therefore , the number of unit cells that has (8.1×6.023×10²³)/27 atoms of Aluminium can be obtained as ,

(8.1×6.023×10²³)/(27×4)=4.516×10²²