what is the heat of formation for C2F3O (g)?

Question

The EPA released a national drinking water health advisory for GenX, a class of compounds that are known polyfluoroalkyl substances. These chemicals have broad uses. The thermal decomposition of GenX compound is below.

C₆HF₁₁O₃(g) ---> CF₃(g) + CO₂(g) + C₂F₄(g) + HF(g) + C₂F₃O (g) ΔH_rxn = 55 kj/mol

a. what is the heat of formation for C₂F₃O (g)?

b. at what temperature(K) does the thermal decomposition reaction become spontaneous if the entropy of the reaction is 79 J/mol x K?

1. I think I would use the G = H - TΔS with G = 0 to find the temperature, is that right?

Answer 1

For part (b), yes, you would use ∆G = ∆H - T∆S and set ∆G = 0.

For part (a), we would need more data, such as ∆Hf for the different species that are present.