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Atkins & de Paula: Elements of Physical Chemistry 5e
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Calculate the collisional flux of hydrogen, H2, molecules on a solid tungsten surface if the pressure of hydrogen is 15 Pa and the temperature is 25°C.
A monolayer of carbon monoxide, CO, molecules is allowed to desorb from the surface of a sample of charcoal. The volume of the gas produced is 128 cm3 at a temperature of 0°C and 1.00 bar. Deduce the effective number of surface sites.
In an experiment to study the adsorption of hydrocarbons onto silica gel, the amount of butane adsorbed onto the gel surface was measured for various pressures of gas at a temperature of 303 K. Use the following data to demonstrate that the adsorption follows a Langmuir isotherm and determine the amount that corresponds to complete surface coverage.
The adsorption of a gas on a solid surface was found to follow a Langmuir isotherm with K = 3.76 kPa-1 at a temperature of 25°C. Determine the pressure of gas required to achieve a fractional surface coverage of 10%.
The isosteric enthalpy of adsorption of ammonia, NH3 on a nickel surface is -155 kJ mol-1. Calculate the relative change in the value of the equilibrium constant for adsorption when the temperature is increased from 25 to 50°C.
The partial pressure of ethene, C2H4, in equilibrium above a nickel surface was measured at different temperatures for a constant surface coverage. Use the following data to determine the isosteric enthalpy of adsorption.
The multilayer adsorption of nitrogen, N2, on a titanium dioxide, TiO2, surface follows a BET isotherm at low temperatures. Experiments have shown that the enthalpy of desorption from the surface is very much greater than the enthalpy for vaporization of the liquid. The data below shows how the volume of nitrogen gas adsorbed, corrected to a temperature of 298 K and pressure of 1 bar, varies with pressure. By plotting a graph, use the data to determine the volume that corresponds to monolayer coverage.
Calculate the rate of absorption of nitrogen, N2, molecules on a tungsten (320) surface for a pressure of 0.10 kPa and temperature of 298 K, given that the sticking probability is 0.74.
Calculate the overpotential necessary to produce a current density of 4.0 × 10-11 A cm-2 from an aqueous H+/H2 couple at a lead, Pb, electrode at a temperature of 298 K. The exchange current density of the system is 5.0 × 10-12 A cm-2 and the transfer coefficient is 0.58 at this temperature.
In an experiment to investigate the electrode kinetics of, The following currents were measured for the H+/H2 system at a mercury electrode for different positive overpotentials for a solution temperature of 298 K. Construct a Tafel plot and use it to determine the transfer coefficient for the system.
