A tank with a capacity of 5000 kg serves as a temporary storage in a process. Initially, the tank...

A tank with a capacity of 5000 kg serves as a temporary storage in a process. Initially, the tank is completely filled with an aqueous solution of HCl at 15% by weight and have a feeding and discharge of the same solution at a rate of 1500 kg / h, in such a way that it is in a steady state. At any given time, the input current changes as so that now pure water enters with the same flow of 1500 kg / h for load. Download continues at 1500 kg / h. Calculate the composition of HCl in the stream leaving the tank (% weight) 2 hours after the change in tank feed.