Use the following information plus the data given in the below tables to calcula

Question

Use the following information plus the data given in the below tables to calculate the second electron affinity, Eea2, of oxygen.

Lattice Energies of Some Ionic Solids (kJ/mol)

Use the given information plus the data given in the above tables to calculate the second electron affinity, Eea2, of oxygen.

TABLE 3.3 Higher lonization Energies (kJ/mol) for Main-Group Third-Row Elements Group 1A 2A 3A. 4A 5A. 6A 7A. 8A. Ei Number Na Mg Al Si P Cl Ar 496 738 578 787 1,012 1,000 1,251 1,520 4,562 1,451 1,817 1,577 1,903 2,251 2297 2665 6,912 7,733 2,745 3,231 2,912 3,361 3,822 3,931 9,543 10,540 11,575 4,356 4,956 4,564 5,158 5,770 13,353 13,630 14,830 16,091 6,273 7,013 6,540 7,238 16,610 17,995 18,376 19,784 22,233 8,495 9,458 8,781 20,114 21,703 23,293 23,783 25,397 27,106 11,020 11,995 The zigzag line marks the large jumps inionization energies.

Explanation / Answer

dH MgO = Mg ( sublimation ) + IE ( Mg to Mg+1 ) + IE ( Mg+1 to Mg2+) + 1/2BE ( O2) + EA1(O) + EA2(O) +     

                                          Lattice energy of MgO

-601.7 KJ/mol = 147.7 KJ/mol + 738 KJ/mol + 1451 KJ/mol + 1/2( 498.4 KJ/mol) - 141 + EA2 ( O) - 3791

EA2(O) = 744 KJ/mol

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