What is the density of `Na_(2)O` having antifluorite-type crystgal stryctutre, if the edge length of cube is `100 gm` and what is the effect on density by `0.05%` Frenkel defect?

Options

A. 823.5 g/`cm^(3)`, density decreases
B. 414.16 g/`cm^(3)`, density decreases
C. 823.5 g/`cm^(3)`, density remains same
D. 414.16 g/`cm^(3)`, density remains same

Explanation

density `(("No.of formula units")xx["Molecular weight to com pound"]xx1.67xx10^(-27)"kg")/("Volume of unit cell")`
`d=(2[2xx24+16]xx1.67xx10^(-24)"gm")/((10^(-8)"cm")^(3))=4xx62xx1.67` g/cc=414.16/cc
Note: Frenkel defects do not change the density of the crystal