J.R. S. answered 03/14/21
Ph.D. University Professor with 10+ years Tutoring Experience
∆Gº = ∆Hº = T∆Sº
Look up the values for ∆Hº and ∆Sº for each of the compounds and plug them into the equation above. The T (temperature) is 298K and don't forget to change ∆Sº values to kJ/Kmol instead of the usually given J/kmol. Or, of course, you could change the ∆Hº values from kJ/mol to J/mol. Either way, just make sure the units are the same.