HETEROGENEOUS CA’I’ALYSI S ERRATA Furaduy SOC. DasczIssaons, No. 6, 1950. P. 36, 1. 9 : E(Ta -= N ) should be 8913, making Qcalc. = - 74.4 kcal./mole-~ for the process, H, + 2’Ta 3 N + 2’Ta = N - H. The observed value chemisorption of hydrogen onto a nitrogen filiii on tantalum is 27 kcal. /mole-l, and so the conclusion is IIOW that the niodel above cannot describe the process. 1’. 183, Table 111, 1. r : AEade. For CV- . . . H+ should be 8.76 not lo199 eV.HETEROGENEOUS CA’I’ALYSI S ERRATA Furaduy SOC. DasczIssaons, No. 6, 1950. P. 36, 1. 9 : E(Ta -= N ) should be 8913, making Qcalc. = - 74.4 kcal./mole-~ for the process, H, + 2’Ta 3 N + 2’Ta = N - H. The observed value chemisorption of hydrogen onto a nitrogen filiii on tantalum is 27 kcal. /mole-l, and so the conclusion is IIOW that the niodel above cannot describe the process. 1’. 183, Table 111, 1. r : AEade. For CV- . . . H+ should be 8.76 not lo199 eV.