SOLID STATES11. AgCI has the same structure as that of'NaCl. The edge

1.	SOLID STATES11. AgCI has the same structure as that of'NaCl. The edge length of unit cell of AgCl is found to be 555 pm and thedensity of AgClis 5.561 g cm 3. Find the percentage of sites that are unoccupied.
Answer» density of a crystal is mass/volume Here mass increases due to filling of impurity thus density increases percentage of site that are unoccupied no of agcl atom in unit cell=4density=5.561g/cm^3volume of unit cell=1710^-23percentage unoccupied=100-percentage occupied=100-{(4143.5/Na)/5.561}/17*10^-23= 0.24%

SOLID STATES11. AgCI has the same structure as that of'NaCl. The edge length of unit cell of AgCl is found to be 555 pm and thedensity of AgClis 5.561 g cm 3. Find the percentage of sites that are unoccupied.

Answer»

density of a crystal is mass/volume

Here mass increases due to filling of impurity thus density increases percentage of site that are unoccupied

no of agcl atom in unit cell=4density=5.561g/cm^3volume of unit

cell=17*10^-23percentage

unoccupied=100-percentage

occupied=100-{(4*143.5/Na)/5.561}/17*10^-23= 0.24%