a. 10 L each of ethanol at –1.1◦C (30◦F), ethylene glycol at –6.67◦C (20◦F), and water at 26.7◦C (80◦F) are poured into a tank and mixed. What is the final temperature? Relevant physical property data are 

b. The final temperature must be 21.1◦C (70◦F). Only the inlet temperature of the water can be adjusted. What should the water temperature be?

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ethanol ethylene glycol water Cp (kJ/kg °C) 2.17 2.30 4.18 p(kg/m³) 790 1,130 1,000