In ionic compounds with certain metals, hydrogen exists as the hydride ion, H^-. Determine the electron affinity of hydrogen; that is, Δ_rH for the process H(g) + e^- : H^-(g). The bond energy of H₂(g) from  Table 10.3; -812 kJ mol^-1 for the lattice energy of NaH(s); and -57 kJ mol^-1 NaH for the enthalpy of formation of NaH(s).

Table 10.3

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TABLE 10.3 Some Average Bond Energiesa Bond Energy, kJ mol-¹ Bond Energy, kJ mol-¹ Bond H-H 436 H-C 414 H-N 389 H-O 464 H-S 368 H-F 565 H-Cl 431 H-Br 364 H-I 297 Bond C-C 347 C=C 611 C=C 837 C-N 305 C=N 615 C=N 891 C-O 360 C=O 736b C-Cl 339 Bond N-N N=N N=N N-O N=O 0-0 0=0 F-F CI-CI Br-Br I-I Bond Energy, kJ mol-¹ 163 418 946 222 590 142 498 159 243 193 151