Question

Describe in detail what you know about the enthalpy, entropy, and free energy changes when a sample of gas condenses to a liquid. How does temperature affect these changes?

Answer 1

Well, since a gas is turning to a liquid, that is the process of condensation. The enthalpy change of condensation is negative, which means that the transition is exothermic (it releases heat).
Entropy in general also decreases, since the particle in the gaseous state slow down to a liquid state and less disorder is being created.
The equation to calculate free energy change is
\[\Delta G = \Delta H - T \Delta S\]
So since the change in enthalpy and entropy are both negative, all you need to do is put in the temperature and get the resulting change in free energy. Since the temperature is positive, the change in free energy is most likely negative.