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2) Integration provides a means to compute how much mass enters or leaves a reactor over a specified time period, as given by M=t1t2Qcdt where t1 and t2 are the initial and final times, respectively. Thus the integral represents the summation of the product of flow times concentration to give the total mass entering or leaving from t1 to t2. The outflow chemical concentration from a completely mixed reactor is measures as Use Simpson's 1/3 rule to estimate the mass of chemical that exits the reactor from t=0 to t=50min