InterviewSolution
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InterviewSolution
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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. 5.96B. `5.96xx10^(-2)`C. `5.96xx10^(-1)`D. `5.96xx10^(-3)` |
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Answer» Molar volume from pykonometic density = `("weight of mass")/("density")=("Weight" (W))/(2.165xx10^(3))m^(3)` Molar volume from X-ray density= `(W)/(2.178xx10^(3))m^(3)` Volume unoccupied `=(W)/(10^(3))((1)/(2.165)-(1)/(2.178))m^(3)=(0.013Wxx10^(-3))/(2.165xx2.178)` `therefore` Fraction unoccupied `=((0.013Wxx10^(-3))/(2.165xx2.178))//((Wxx10^(-3))/(2.165))=5.96xx10^(-3)` |
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