<prompt> Which law states that the amount of a substance crossing a given area is directly proportional to the area available for diffusion, concentration gradient and diffusion coefficient?Universal gas lawDaltons lawFicks lawAll of the above  <response>: Fick Law of Diffusion:Diffusion is well described by Fick law of diffusion. According to this law, amount of a substance crossing a given area is directly proportional to the area available for diffusion, concentration gradient and a constant known as diffusion coefficient.Thus, Amount diffused Area x Concentration gradient x Diffusion coefficientFormula of Fick law: 