The pyknometer density of NaCl crystal is 2.165xx10^(3)kg m^(-3) while its X - rays density is 2.178xx10^(3)kg m^(-3). The fraction of the unoccupied sites in NaCl crystal is

The pyknometer density of NaCl crystal is 2.165xx10^(3)kg m^(-3) while

1.	The pyknometer density of NaCl crystal is 2.165xx10^(3)kg m^(-3) while its X - rays density is 2.178xx10^(3)kg m^(-3). The fraction of the unoccupied sites in NaCl crystal is
Answer» `5.968` `5.96xx10^(-2)` `5.96xx10^(-3)` `5.96xx10^(-4)` SOLUTION :Molar volume from pyknometer density `= (M)/(2.165xx10^(3))m^(3)` Molar volume from X - RAY density `= (M)/(2.178xx10^(3))m^(3)` `therefore` Volume unoccupied `=((1)/(2.165)-(1)/(2.178))(M)/(10^(3))m^(3)` Fraction unoccupied `=((1)/(2.165)-(1)/(2.178))//(1)/(2.165)` `= 5.96xx10^(-3)`