Textbook problem 4J.3

[Evelyn-Marian Barber]

Calculate the change in molar Gibbs free energy for the process
at 1 atm and (a) -15.0°C (b) -45.0°C (see Tables 4C.1 and 4F.1). In each case, indicate whether vaporization would be spontaneous.

I used this equation to find the molar Gibbs free energy: deltaG= deltaHvap - T(deltaSvap). Would this be the right equation to find these answers, or is there another equation we are supposed to use?

[Chem_Mod]

That is the right equation! Just make sure the temperature is in K.

[Andrew Dinh 2L]

That's the right equation, but adding on to what the previous post said, make sure that the units are all the same, since ΔS is usually given in J/mol*K while ΔH is usually given in kJ/mol.