Dissociation energies of alkali metal cyanides

✍ Scribed by Juliet N. Mulvihill; Leon F. Phillips

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 297 KB
• Volume: 33
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(75)85785-x

✦ Synopsis

Equilibrium constants for the reaction 51 + HCN * i MCN + H. where hl is an alkali metal atom have been determined by rnensuring the I:ffect of added CzN, on the intensity of emission of metallic resonance lines from a fuel-lich, pre-mlsed H&+/O:! flame at 1500 K. The yield of HCN from the cyanogen was measured by withdrawing samples through a quartz micro-probe for mass spcctromctric analysis. The cnthalpy change of the reaction was calculated by the third-law method. \Vc find DOh1-c~ to be 497,474,497,487, and 501 kJ mol-' for ht = Li, NJ, K, Rb, and Cs, respectively, 311 * 22 kJ mol-' .