Aqueous A (C_A0 = 1 mol/liter) with physical properties close to water (p = 1000 kg/m³, CB = m²/s) reacts by a first-order homogeneous reaction (A→R, k = 0.2 s^-I) as it flows at 100 mm/s through a tubular reactor (d_t = 50 mm, L = 5 m). Find the conversion of A in the fluid leaving this reactor.