Three hundred L/h of a 20 mole% C₃H₈–80% n-C₄H₁₀ gas mixture at 0°C and 1.1 atm and 200 L/h of a 40 mole% C₃H₈–60% n-C₄H₁₀ mixture at 25°C and 1.1 atm are mixed and heated to 227°C at constant pressure. Enthalpies of propane and n-butane are listed below. Assume ideal-gas behavior. 

(a) Calculate the heat requirement in kJ/h. 

(b) Where in your calculations did you use the ideal-gas assumption?

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Propane Ĥ(J/mol) Butane T(°C) Ĥ(J/mol) 25 1772 2394 227 20,685 27,442