The two stable isotopes of boron exist in the following proportions: 19.78% 105B (10.01 u) and 80.22% 11 2B (1.01 u). Calculate the average atomic mass of boron.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Ibelieve the answer is d. titaniumhope my answer has you : )

It will appear as o2(g) as a reactant