Question

1

Answer 1

Assuming this is spontaneous..
enthalpy of the gas will decrease.
Entropy of the gas will decrease.
Free energy will decrease (spontaneous).

Answer 2

temperature is crucial actually.

Answer 3

As the temperature rises, the enthalpy of the gas will increase. Enthalpy is basically a measure of the internal energy of a substance. At a higher temperature it has a higher internal energy. But, the change in enthalpy going from one state to another is basically constant. The entropy of the gas will also increase somewhat with temperature. But the change in entropy when a sample condenses from a gas to a liquid is basically constant. The free energy change will be greatly effected by increasing temperature. In this example, the free energy as a gas condenses to a liquid will INCREASE as the temperature goes up. If the free energy change is positive, the process becomes non-spontaneous at that temperature. i.e., the gas won't condense. If the free energy change is negative (free energy decreases), then the gas will spontaneously condense at that temperature. So as the temperature rises the free energy change may start out negative...it gets larger and larger as the temp rises...eventually the free energy change will become positive and the gas won't condense spontaneously anymore.