Gibbs free energy calculation for redox reaction

I was wondering if it is correct to calculate the Gibbs free energy of reaction at $$P = \pu{1 atm}$$ and $$T = \pu{1100 K}$$ using the NIST-JANAF thermochemical tables. For example, for the reaction of ammonia and nitrous oxide:

$$\ce{NH3(g) + 1.5 N2O(g) -> 2 N2(g) + 1.5 H2O(g)}$$

Can I later use this result to calculate the electric potential knowing the amount of electrons transferred?

I'm no electrochemist, I'm just trying to estimate the open circuit voltage for a fuel cell.

• You should always be able to compute open-circuit potentials from free energies. I gather you know this and are asking about the appropriateness of your approach for computing free energies. Is that what your question really is? – Curt F. Jul 15 at 17:51
• Yes, I am familiar with the formula and learnt how to use it. I would like to know if the way I am computing the free energies is correct. – dareToDiffer07 Jul 16 at 14:49