Question #3. (Marks 20) Acetylene (C_H2) is hydrogenated to form ethane (C_H). The feed to the reactor contains 1.50 mol H/mol CH2 (a) Calculate the stoichiometric reactant ratio (mol H2 react/mol CH2 react) and the yield ratio (kmol CH formed/kmol H2 react). (4 marks) (b) Determine the limiting reactant and calculate the percentage by which the other reactant is in excess. (4 Marks) (c) Calculate the mass feed rate of hydrogen (kg/s) required to produce 4 x 10 metric tons of ethane per year, assuming that the reaction goes to completion and that the process operates for 24 hours a day, 300 days a year. (10 Marks) (d) There is a definite drawback to running with one reactant in excess rather than feeding the reactants in stoichiometric proportion. What is it? (2 Marks)