AP EAPCET 24-Aug-2021 Shift 1 Paper

Molar mass of NaCl=58.5
1g of NaCl=

1

58.5

mole of NaCl
1g of NaCl=

1

58.5

×6.022×1023 molecules of NaCl
4 molecules of NaCl are present as Cl−present occupy fcc lattice =4 ions of Cl−
occupy Na+octahedral site =4 ions of Na+
1 unit cell contain 4 molecules of NaCl
1 molecule contain

1

4

unit cell.

1

58.5

×6.022×1023 molecule contains
=

1

58.5

×

6.022×1023

4

unit cell
Thus, 1 g of NaCl contain =2.57×1021 unit cell.