You are trying to identify a mineral that has been brought to your laboratory.
If KCl has the NaCl structure it is face centered cubic with a Cl atom at 0, 0, 0 and a K atom at ½ ,0 , 0.
There are four lattice points (LPs) in the KCl unit cell. The molar mass of K is 39.10 g/mole, and for Cl it is 35.45 g/mole, thus each lattice point has a molar mass of 74.55 g/mole.
From the density of KCl we can obtain the number of lattice points per unit volume and from that the lattice parameter.
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