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Ask iit jee aieee pet cbse icse state board experts Expert Question: NaCl
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[Post New]6 Apr 2007 10:34:50 IST
    Subject: NaCl
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tejasvi2389 (33)

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KF has NaCl structure. What is the distance between K+ anf F- in KF is the density is 2.48g/cc?
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[Post New]6 Apr 2007 11:32:05 IST
    Subject: Re:NaCl
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sudeep.kumar (611)

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Use
 
d = Z.M / N.a3
 
For NaCl structure, Z is 4 as there are four NaCl molucles in one unit cell.
M is the molecular mass of KF.
N is the avogado's no.
d is density, which has been given in the prob
a is the edge length of the unit cell...
 
Calculate a from the above formula..
In NaCl sructure... there is one cation b/w the two anions along a edge.. so half of the edge length, ie a/2 would be the dist b/w K and Cl... got it??
Sudeep Kumar
(B tech, IITd)

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[Post New]6 Apr 2007 11:41:06 IST
    Subject: NaCl
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chimanshu_007 (11616)

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ans is 268.7pm
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