please explain to me how we solved questions 9 and 10 9. Which of the following

Question

please explain to me how we solved questions 9 and 10

9. Which of the following statements is true in relation to the formation of the stable ionic compound, sodium chloride? a. The net absorption of 147 kJ/mol of energy for the formation of the gaseous sodium and chloride ions, is mainly responsible for the formation of the stable ionic compound. * b. The lattice energy provides the necessary stabilization energy for the formation of sodium chloride c. Sodium chloride is stable because it was formed from the combination of isolated gaseous 1ons d. The first ionization energy of sodium contributes favorably to the overall formation of sodium chloride e. The release of energy as the solid sodium chloride is formed, leads to an overall increase in the potential energ Section 9.2 Difficulty Level: hard 10 For two ions with charges qi and q separated by a distance r, the potential energy can be calculated from Coulomb's law: Calculate the energy released when I mole NaCl is formed, if the constant k = 1.11x10-10 C"/J.m, the charge Na-=-e and that on Clis-e, where e = 1.602x1019 C, and r = 282 pm. a. +501 kJ/mol b. +89.7 kJ/mol c. -297 kJ/mol s d. -494 kJ/mol e. -371 kJ/mol

Explanation / Answer

9.

(b) lattice energy is responsible for stabilization of formation of NaCl .If you calculate just the free energy of formation of compound in gaseous state ,it will be positive and not a thermodynamically favoured reaction.

10.

q1 =1.602 x 10-19 C

q2 = -1.602 x 10-19 C

k =   1.1 x 10-10C2/J.m

r = 282 pm = 282 x 10-12m

E = 1.602 x 10-19 C x -1.602 x 10-19 C / 1.1 x 10-10C2/J.m x 282 x 10-12m

E = -8.27 x 10-19 J/NaCl formula

for 1 mole = -8.27 x 10-19 J x 6.022 x 1023 ~ -494 kJ/mol

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