High levels of ozone (O3) make rubber deteriorate, green plants turn brown, and cause people to have difficulty breathing.

a. Calculate ΔG at 298 K for the formation of 1 mole of O3 from O2 in urban smog, where [O2] = 0.210 atm and [O3] = 5.00 × 10^−7 atm.
b. Is the formation of O3 from O2 favored at all T, no T, high T, or low T?
c. Calculate ΔG∘ for this reaction at 298 K.