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,U_rep = A/rⁿ,is

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

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