A ---------> C Is carried out isothermally in a 20-dm³ constant-volume batch reactor. Twenty moles of pure A is initially placed in the reactor. The reactor is well mixed. (a) If the reaction is first order: -TA = KCA with k = 0.865 min-¹ Calculate the time necessary to reduce the number of moles of A in the reactor to 0.2 mol. (b) If the reaction is second order: -TA = KC² with k = 2 (dm³/mol.min) Calculate the time necessary to consume 19 mol of A.