One thousand kilograms per hour of a mixture of 50%benzene (B) and 50%toluene (T) by mass is separated by distillation into two fractions. The mass flow rate of benzene in the top stream is 450 kg B/h and that of toluene in the bottom stream is 475 kg T/h. The operation is at a steady state. Write balance on benzene and toluene to calculate the unknown component flow rates in the output stream. What is the mass flow rate of the unknown component in the top stream?

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