Item 8 Part A CI The lattice energies of NaCl and KF are given in the table in t

Question

Item 8 Part A CI The lattice energies of NaCl and KF are given in the table in the introduction. Based on the lattice energies, would you expect the Na or the K - F distance to be longer? NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions. Match the words in the left column to the appropriate blanks in the sentences on the right. Lattice Lattice Reset Help Compound Energy Compound Energy kJ/mol 1030 834 730 910 k.J/mol LiF LiCl Lil NaF NaC 788 NaBr732 Nal KF KCI KBr CsCl657 MgCl22326 SrCl2 2127 NaCl KF smaller directly inversely larger Lattice energy is proportional to the distance between two ions in an ionic compound; therefore, the compound with the smaller lattice energy will have the distance between the ions. MgO3795 CaO SrO 3414 3217 682 808 701 671 ScN 7547 Given NaCl and KF, the one with the smaller lattice energy is You may want to reference( pages 302-306) Section 8.2 while completing this problem. Therefore, of the two, the one with the longer distance between atomsis

Explanation / Answer

Lattice energy is inversly propotional to the distance between two ions in an ionic compound ( decrease in ion distance require high lattice energy)

therefore, the compound with the smaller lattice energy will have the larger distance between the ions

between NaCl and KF, KF having the lower lattice energy

the longer distance between atoms is KF

consider one more this the lattice energy not only base on distance but also on the size of the atom

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