Question

Calculate the enthalpy of desorption of hydrogen gas (H2) from a platinum surface, given that the temperature of the surface is 298 K and the pressure of H2 gas above the surface is 1 atm. The adsorption enthalpy of H2 on Pt is -43300 J/mol. (Assume ideal gas behavior for H2.)

Answer 1

To calculate the enthalpy of desorption of hydrogen gas  H2  from a platinum surface, we can use the following equation:H_desorption = -H_adsorptionGiven that the adsorption enthalpy of H2 on Pt is -43,300 J/mol, the enthalpy of desorption can be calculated as follows:H_desorption = - -43,300 J/mol H_desorption = 43,300 J/molTherefore, the enthalpy of desorption of hydrogen gas  H2  from a platinum surface is 43,300 J/mol.