1.

The pyknometer density of NaCl crystal is 2.165 xx 10^(3) kg m^(-3) while its X -rays density is 2.178 xx 10^(3) kg m^(-3). The fraction of the unoccupied sites in NaCl crystal is :

Answer»

5.96
`5.96 XX 10^(-2)`
`0.596`
`5.96 xx 10^(-3)`

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