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Question: degree of freedom analysis question the above textbook solution states...

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The flowchart is shown below ,, (mol/s) 0.0403 mol C,H/mol 0.9597 mol air/mol h(mol/s) 0.023 mol C,H,/mol 0.977 mol air/mol i2 (mol air/s) There are three unknown species (%) is fuel, (h, ) is fuel-air mixture and (,) is air and two balances 3 unknown species (ni,n2%) -2 balances The sum of the above two steps is one. So, the degree of freedom is 1 Therefore, the degree of freedom is

Degree of Freedom Analysis question

The above textbook solution states that there are 3 unknown species (n1, n2, n3), and 2 balances (one for propane, and one for air). This yields a degree of freedom of 1.

However, couldn`t we add an "overall system" equation? (n1+n2 = n3)? this would give us a 3rd equation, and make our DOF of zero.

Is this allowed? If not, could some one please explain in detail why not?

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