Draw and label a flowchart arid determine the number of degrees of freedom for each of the given systems. Give a feasible set of design variables and, if possible, an infeasible set. The solution to part (a) is given as an example.

(b) A natural gas containing methane, ethane, and propane at temperature T₁ is mixed with preheated air at temperature T₂, and the mixture is heated to 200?C. Calculate the required heat input.

(c) A stream containing hexane vapor in nitrogen at temperature T₁ is cooled at constant pressure, condensing 95% of the hexane. Calculate the product temperature.

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mi[kg H₂SO₂ (aq)] @ T₂(°C) *₁(kg H₂SO₂/kg) m₂kg H₂0 (1)]@ T₂(°C) MIXER m3(kg) 7(°C) x3(kg H₂SO/kg)