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The work described in this paper was done during 1943 and 1944 at the request of the Manhattan District of the U . S . Army Corps of Engineers. At the time the work was done the need for data of moderate accuracy was urgent. For thi reason, very li ttle time could be devoted to development of apparatus, and the purity of the materials supplied for the measurements was not investigated. The results obtained are, therefore, not of high accuracy. It is believed, however, that they are of sufficient interest to justify their publication. We were requested to measure the heats of the following two reactions:

journal of research of the national bureau of standards

Heat of fluorination of cobaltous fluoride, and the heats of reaction of cobaltic fluoride with hydrogen and with bis(trifluoromethyl)benzene (a,a,a,a',a',a'-hexafluoroxylene)