Calculating the Energy Change in the Formation of an Ionic Compound Calculate the net energy change in kilojoules per mole of KF( s ) that takes place on formation of KF( s ) from the elements: [latex]K( s) + 1/ 2 F_{2} ( g) → KF( s) [/latex] . The following information is needed: Heat of sublimation for K(s) = 89.2 kJ/mol [latex]E_{ea}[/latex] for F(g)= -328 kJ/mol Bond dissociation energy for [latex]F_{2}[/latex](g) = 158 kJ/mol [latex]E_{i}[/latex] for K(g) = 418.8 kJ/mol Electrostatic interactions in KF(s) = -821 kJ/mol STRATEGY Write a chemical reaction for each step in the process of forming the ionic solid KF and draw a Born–Haber cycle similar to Figure 6.7. The sum of the energy changes for each step should give the energy change for the overall reaction.

Question 6.7: calculating the energy change in the Formation of an Ionic c...

Calculating the Energy Change in the Formation of an Ionic Compound

Calculate the net energy change in kilojoules per mole of KF(s) that takes place on formation of KF(s) from the elements: $K(s) + 1/2 F_{2} (g) → KF(s)$ . The following information is needed:

Heat of sublimation for K(s) = 89.2 kJ/mol $E_{ea}$ for F(g)= -328 kJ/mol

Bond dissociation energy for $F_{2}$ (g) = 158 kJ/mol $E_{i}$ for K(g) = 418.8 kJ/mol

Electrostatic interactions in KF(s) = -821 kJ/mol

STRATEGY

Write a chemical reaction for each step in the process of forming the ionic solid KF and draw a Born–Haber cycle similar to Figure 6.7. The sum of the energy changes for each step should give the energy change for the overall reaction.

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