Question

In a reactor two stream are entering, one with C6H6 at 10 atm and 27^oC, and another with H2 at 10 atm and 0^oC, producing C6H12 and H2 at 10 atm and 23^oC, what are the total degrees of freedom?

(a) 10

(b) 15

(c) 20

(d) 23

Answer 1

Right option is (b) 15

To explain I would say: Total species = 1 + 1 + 2 = 4, total stream flows = 3, stream pressures = 3, stream temperatures = 3, heat released = 1, and extent of reaction = 1, => degrees of freedom = 4 + 3 + 3 + 3 + 1 + 1 = 15.