Molybdenum Arsenide, MoAs₂

Molybdenum Arsenide, MoAs₂, is formed by heating powdered molybdenum for 36 hours with arsenic at 570° C., the excess of arsenic then being removed by sublimation. It is a black powder of density 8.07 at 25° C. It resembles molybdenum phosphide in being insoluble in concentrated hydrochloric acid or ammoniacal hydrogen peroxide, but it is readily soluble in nitric acid, hot concentrated sulphuric acid or aqua regia.