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KF has NaCl structure. If distance betwe...

KF has NaCl structure. If distance between `K^+` and `F^-` is 269 pm, find the density of KF . (At mass of K=39 and F=19)

Text Solution

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For NaCl type structure of KF
`a=2(r_(K^(+))+r_(F^(-)))` or `2xx269=538` pm
`rho = (Z xx M)/(N_(0)xx a^(3))=(4xx58)/(6.02xx10^(23)xx(538xx10^(-10))^(3))`
`rho = 2.48 g//cm^(3)`
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