Question

KF has the same type of crystal structure as NaCl. The unit cell of KF has an edge length of 5.39 Å. Find the density of KF in g/cm3

Answer 1

You probably know the edge length for NaCl but I do not.

mass of NaCl molecule = molecular mass of NaCl/6*10^23
mass of KF Molecule = molecular mass of KF/6*10^23

density of KF = length of KF^3/length of NaCl^3 * (Mass of KF/Mass of NaCl)

note Avagadro's number cancels

Answer 2

Oh, times density of NaCl of course