Determine the best contact model and the operation temperature for the following reaction system when the desired product is P and the pre-exponential factors of both reactions are similar. A + B -> P r1 = A1 el-Eaz/RT) CA CB 0.3 = A1 A+B -> Q r2 = A2 el-E/RT) 0.5 CA A2 1.8 CB EA1 = 80000 kJ mol-1 EA2 = 40000 kJ mol-1