Why does potassium permanganate diffuse faster than methylene blue?

 The molecules in potassium permanganate are smaller and lighter. Which helps it diffuse faster. 

Methylene Blue has a higher molecular weight than the compound potassium permanganate. Potassium permanganate has smaller, lighter molecules which diffuse faster than methylen…

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).

Do not include the unexpected results