Please Answer both questions

4. Calculate the heat exchanger area required to heat 30 kmol/hr toluene liquid from 25 to 75 C at 1 atm of pressure. The average heat capacity of toluene over this temperature range is 159 J K-1 mol-1. The toluene will be heated with saturated steam at 476 kPa and at a mass flow rate of 1200 kg/hr. The heat exchanger is counter-current and single pass and has a U value of 800 W m-2 C-1. 5. Calculate the mass flow rate of saturated steam (T = 255C, quality - 1.0) required to heat 50 kmol/hr benzene vapor from 200 to 235 C at 1 atm of pressure. The average heat capacity of benzene over this temperature range is 82.4 J K-1 mol-1. Assume that the steam quality leaving the heat exchanger is 0.20