A counter flow heat exchanger is utilizing a cold 20% magnesium chloride solution to cool a flow of hexane. The hexane enters the heat exchanger at 26°C and the magnesium chloride solution enters at 0°C. The volumetric flow rates of the hexane and magnesium chloride solution are 30 L/s and 26 L/s, respectively. The heat exchanger has an overall heat transfer coefficient of 1,280 W/m2-K. The required heat transfer rate between the fluids is 700 kW. Determine,

a. The outlet temperature of the hexane (°C)

b. The outlet temperature of the magnesium chloride solution

c. The required heat transfer area of the heat exchanger (m2)