Question: take a basis of 100mol produced assume that the feed...

Take a basis of 100mol produced. Assume that the feed contains only ethane and chlorine, and that all of the chlorine is consumed. Carry out a Degree of Freedom analysis based on the atomic species balance.

For PART B: Zookal textbook solutions says that the DOF is 2.

I calculated the DOF on an ATOMIC/ELEMENTAL BALANCE as follows....

Unknown variables (5) - Number of Atomic species (3) - nonreactive species (0) - chemical equations (2) = 0

* My DOF calculation = 0 (as shown above in the calculations)

*Zookal Textbook solutions DOF = 2

Can some one please explain what I may be doing wrong?