The elemental reaction in the gas phase A+B=C is carried out in a batch reactor to achieve a 90% conversion of A. An equimolar mixture of A and B is fed into the reactor. The reaction occurs at 1 atm (constant) and 60 F in isothermal form. At that temperature, k=0.1 ft^3/(lbmols). Based on this information: (a) Propose an appropriate kinetic equation for this reaction. (b) Express the concentrations of A and B based on the conversion. (c) Calculate the necessary residence time in hours.