4.52. Acetylene is hydrogenated to form ethane. The feed to the reactor contains 1.50molH2/mol2H2. (a) Calculate the stoichiometric reactant ratio ( molH2 react/mol C2H2 react) and the yield ratio (kmol C2H6 formed/ kmolH2 react). (b) Determine the limiting reactant and calculate the percentage by which the other reactant is in excess. (c) Calculate the mass feed rate of hydrogen (kg/s) required to produce 4106 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. (d) There is a definite drawback to running with one reactant in excess rather than feeding the reactants in stoichiometric proportion. What is it? [Hint: In the process of Part (c), what does the reactor effluent consist of and what will probably have to be done before the product ethane can be sold or used?]