Question
THE PYKNOMETRIC DENSITY OF NaClis 2.165X 10-3 wHILE ITS Xray density IS 2.178X103 kgm-3 the fraction of unoccupied sites in NaCl crystal is?ans) 5.96x 10-3. how we will caculate this fraction
Joshi sir comment
Pyknometer is a device to measure density of substance. Density measured by pyknometer is called pyknometric density. In porous solids this density may be different from true density of solid if the liquid used is unable to fill the pores of solid.
I think that the first density will be 2.165 * 103
difference of density = 2178-2165 = 13 kg/m3
so fraction of unoccupied site = 13/2178 = 5.96 * 10-3