Hydrogen (H 2 ) gas is commonly used to reduce iron oxide ores to metallic ores. Consider the following heterogeneous reduction reactions on a nonporous flat surface of the following ores: Write the...

Hydrogen (H₂) gas is commonly used to reduce iron oxide ores to metallic ores. Consider the following heterogeneous reduction reactions on a nonporous flat surface of the following ores:

Write the integrated form of the flux equation, assuming (1) steady-state one-dimensional flux through a gas film of thickness
 along the coordinate z; (2) constant gas composition at the edge of the gas film; (3) instantaneous reaction at the surface; and (4) constant temperature and pressure. Which reactions result in an equimolar-diffusion flux of the gas-phase species? Hint: Carefully consider the stoichiometry associated with each reaction.