define diffusion

Question

give a brief description of hydrochloric acid and ammonia

Answer 1

What is the question? Define diffusion?  Diffusion is the movement, in the absence of added energy, of a solute from an area of high concentration to an area of lower concentration and obeys Ficks Law. If you are asking about diffusion of HCl vs NH3, that will obey Grahams Law and ammonia will diffuse faster because diffusion of a substance is inversely proportional to the sq rt of the molar mass. Thus rate1/rate2 = sqrt MW2/sqrt MW1