Estimate the standard enthalpies of formation at 25 °C and 1 bar of 

(a) OH(g); 

(b) N₂H₄(g). 

Write Lewis structures and use data from Table 10.3, as necessary.

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 C=C C=C 837 C-N 305 C=N 615 347 611 C=N C-O C=O 736b C-Cl 339 891 360 Bond Energy, kJ mol-¹ 1 Bond N-N 163 N=N 418 N=N 946 -0 222 N=O 590 -O 142 0=0 498 F-F CI-CI Br-Br I-I 159 243 193 151