InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
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)`A. `5.99`B. `5.96 xx 10^(-2)`C. `5.96 xx 10^(-1)`D. `5.96 xx 10^(-3)` |
|
Answer» Correct Answer - d Mole volume from pyknometric density `V_(p) = (M)/(2.165 xx 10^(3)) m^(3)` Molar volume from X-rays density `V_(x) = (M)/(2.178 xx 10^(3)) m^(3)` `:.` volume unoccupies`= (M)/(10^(3)) ((1)/(2.165)-(1)/(2.178))` `= (0.013 xx M xx 10^(-3))/(2.165 xx 2.178 )m^(3)` `:.` fraction of volume occupied `= (0.013 xx M xx 10^(3))/(2.165 xx 2.175) //(M xx 10^(-3))/(2.165)` `= 5.96 xx 10^(-3)` |
|