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KF Has a Face-Centered-Cubic Lattice Structure and the Equilibrium Spacing

Question 46

Multiple Choice

KF has a face-centered-cubic lattice structure and the equilibrium spacing between the K+ and F- ions is 0.269 nm.It has a dissociation energy of 498 kJ/mol.The constant n in the empirical potential energy,Urep = A/rn,is


A) 2.2
B) 4.3
C) 5.8
D) 6.9
E) 8.7

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