(a) The overall reaction to yield methane (CH4) from synthesis gas (CO, H2 ) over a ruthenium catalyst, follows the mechanistic steps (1-8) shown in Table Q2.1. Assuming that the rate limiting step is the adsorption of the diatomic hydrogen molecule (H2), write expressions to describe the following: (i) The rates of adsorption and desorption for the diatomic hydrogen molecule (H2), AND the rate equation at equilibrium. (3 marks) (ii) The surface or fractional coverage () for the "H" atom. (4 marks) TABLE Q2.1. (a) The overall reaction to yield methane (CH4) from synthesis gas (CO, H2 ) over a ruthenium catalyst, follows the mechanistic steps (1-8) shown in Table Q2.1. Assuming that the rate limiting step is the adsorption of the diatomic hydrogen molecule (H2), write expressions to describe the following: (i) The rates of adsorption and desorption for the diatomic hydrogen molecule (H2), AND the rate equation at equilibrium. (3 marks) (ii) The surface or fractional coverage () for the "H" atom. (4 marks) TABLE Q2.1