In solid KCl, which has the same solid state structure as NaCl (simple cubic unit cell), the distance between the ions is 314 pm. Calculate the length of the edge of the unit cell.

The edge length of the KCl unit cell is 314 pm.

Explanation:

In simple cubic unit cell the edge length of the unit cell id given by :

r = 0.5 a

r = radius pf the atom

a = edge length

We have :

Distance between the ions in KCl unit cell = d = 314 pm

And we know that :

d = 2r

d = 2 (0.5a)

d = 1.0a = a = 314 pm

So, this means that edge length of the KCl unit cell is 314 pm.

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.