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KF and NaCl struture. If the distance be...

KF and NaCl struture. If the distance between ` K ^(+) and F^(-)` is 269 pm, find the denisty of KF ( ` N_(A) = 6.02 xx 10^(23) "mol"^(-1)` a atomic mass of copper = 63.5

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The correct Answer is:
`8.9 " g cm"^(-3)`
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KF has NaCl structure. If distance between K^(+) & F^(-) is 269 pm, find the density of KF. (At mass of K = 39 and F = 19).

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