A 15% Na2SO4 solution is fed at the rate of 12 lb/min into a mixer that initially holds 100 lb of a 50-50 mixture of Na2S04 and water. The exit solution leaves at the rate of 10 lb/min. Assuming uniform mixing, what is the concentration of Na2SO4 in the mixer at the end of 10 min? Ignore any volume changes on mixing. 12 Ib/min 10 Ib/min 1.8 Ib No2SO4 10.2 Ib H20 -At t = 0, 50 lb NozSO4 50 Ib H20

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