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Nice application for minimization of Gibbs Free Energy! Some of the things that needed to be fixed:

• Use m.log instead of np.log when defining Gekko equations. This allows automatic differentiation to provide exact first and second derivatives to the solver (IPOPT).
• Don't override nA-nH with numeric values. Use the nA.value property.
• You can add equations such as nA>=0 or just add a lower bound by setting nA.lower=0. Using upper and lower limits on the variables is more efficient than adding inequality constraints.
• The indentation doesn't appear to be correct in your posted code. I assumed that everything after the for T in T: statement should be indented as part of that loop. Please check this.
• I added an upper bound for your variables of 5.0. Otherwise, the solution is unbounded. You shouldn't typically have a variable at a bound for Gibbs Free Energy minimization problems so please check this as well. I also set the lower bound to 0.01 so that the m.log terms would not be zero and cause an evaluation error.

You are missing an alias from your table. You never told the engine what you are referring to as "p".

Correct syntax would be:

You are fine to put a , after

Some code might have changed in time. The classes of the objects were messed up within the process. This works:

When I think about storage of variables in C, mostly I think about machine-independent boxes. So given