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The pyknometric density of sodium chlori...

The pyknometric density of sodium chloride crystal is `2.165xx10^(3)kg m^(-3)` while its `X` ray density is `2.178xx10^(3)kg m^(-3)` the fraction of unoccupied sites in `NaCl` crystal is

A

`5.96xx10^(-1)`

B

`5.96xx10^(-3)`

C

`5.96`

D

`5.96xx10^(-2)`

Text Solution

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The correct Answer is:
2
`X` ray density is higher because corresponds to occupied space only as `X`-rays are diffracted by constituet particles.On the hand ,pyknometric density is lower as it correspondense to occupied as well as unoccupied space. Thus, the fraction of unoccupied site in `NaCl` crystal is given as
`"X ray density -pyknometric density(u"/("X-ray density (occupied s")`
`=(2.178xx10^(3)-2.165xx10^(3))/(2.178xx10^(3))`
`=(0.013xx10^(3))/(2.178xx10^(3))`
`=0.00596=5.96xx10^(-3)`
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The pyknometric density of sodium chloride crystals is 2.165 xx 10^(3) kg m^(-3) while X -ray density is 2.178 xx 10^(3) kg m^(-3) . The fraction of the unoccupied sites in sodium chloride crystal is

The pyknometric density of NaCl crystal is 2.165 xx 10^(3 kg m^(-3) while its X -ray density is 2.178 xx 10^(-3) kg m^(-3) . The fraction of unoccupied sites in NaCl crystal is a. 5.96 b. 5.96 xx 10^(-2) c. 5.96 xx 10^(-1) d. 5.96 xx 10^(-3)

Knowledge Check

  • The pyknometric density of sodium chloride crystal is 2.165xx10^3 " kg m"^(-3) while its X-ray density is 2.178xx10^3 " kg m"^(-3) . The fraction of the unoccupied sites in sodium chloride crystal is

    A
    5.96
    B
    `5.96xx10^(-2)`
    C
    `5.96xx10^(-1)`
    D
    `5.96xx10^(-3)`

  • The pyknometric density of sodium chloride crystal is 2.165times10^(3)kg" " m^(-3) while its X-ray density is 2.178times10^(3)kg" " m^(-3) . The fraction of unoccupied sites in sodium chloride crystal is

    A
    `5.96times10^(-3)`
    B
    5.96
    C
    `5.96times10^(-2)`
    D
    `5.96times10^(-1)`

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