What food item will provide a minimum of 1 mole of both sodium and potassium with the least mass? What is that mass?

The answer is b on plato.

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess

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).