The liquid-phase reaction A+B-->R+S takes place in a 100 L continuously stirred tank reactor operating isothermally and at steady state. The rate of formation of R is given by k*CA*CB and the rate constant, k, is 7 L mol-1 min-1. Two feed streams, one containing 4.60 mol/L of A and the other containing 1.20 mol/L of B are introduced in equal volumes into the reactor. What is the initial concentration of the limiting reactant after the two streams immediately mix as they enter the CSTR?