כטן ε БӘЛ (b) Adsorption of a solute can take place from the liquid surface to a solid surface when the solution is treated with a solid. Assuming that the solute adsorbs strongly compared to the solvent, sketch comparative qualitative plots of x/m (amount adsorbed /g) vs C (concentration in solution) for the individual adsorption of ethyl, n- propyl and n-butyl alcohols from an aqueous solution to a hydrophilic silica sample. Give suitable explanation for the plots. (2)

What is the difference between a diffusion reaction and a diffusion-controlled reaction?

Nitrogen gas adsorbed on a surface to the extent of 1.242 cm3 g−1 at 350 kPa and 180 K, but at 240 K the same amount of adsorption was achieved only when the pressure was increased to 1.02 MPa. What is the enthalpy of adsorption of nitrogen on the surface?

Hydrogen purification was conducted at 550 °C using a 3-mm-thick palladium sheet having an area of 0.25 m?. (a) Calculate the diffusion coefficient of hydrogen in palladium at this temperature. The preexponent and the activation energy are 12,000 J/mol and 6.5 x 108 m?/s, respectively. R = 8.3145 J/mol-K. (b) When the steady-state condition was attained, hydrogen concentrations at the high- and low-pressures side of the plate were 1.7 and 0.5 kg/m³. Compute the amount of hydrogen that passes through the sheet per hour (in kg/h).