(Solved): Mass Balances 1. Initially, a tank contains 500 kg of salt solution containing 10% salt. At point ( ...

Mass Balances 1. Initially, a tank contains 500 kg of salt solution containing 10% salt. At point (1) in the control volume shown below, a stream enters at a constant flow rate of 10 kg/h containing 20% salt. A stream leaves at point (2) at a constant rate of 5 kg/h. The tank is well stirred. Derive an equation relating the weight fraction WA of the salt in the tank at any time t in hours. (1) 10 kg/h (20% salt) initial 500 kg salt solution (1 = 0, 10% salt) control volume (2) 5 kg/h