Abstract
The heats of reaction of arsenic with fifteen group 3A metals have been measured by means of dynamic differential calorimetry. The heats of formation obtained at the reaction temperatures, in kcal/mole, are as follows: ScAs, –65.2 ± 6.0; YAs, –77.4 ± 3.4; LaAs, –73.0 ± 4.5; CeAs, –68.9 ± 3.0; PrAs, –73.4 ± 3.1; NdAs, –72.7 ± 3.5; SmAs, –72.0 ± 3.5; GdAs, –74.4 ± 3.2; TbAs, –75.0 ± 3.4; DyAs, –78.1 ± 5.0; HoAs, –72.3 ± 3.3; ErAs, –75.6 ± 3.2; TmAs, –72.8 ± 3.2; YbAs, –61.8 ± 2.9; LuAs, –75.2 ± 3.1.