For the following statements, choose the word or words inside the parentheses th

Question

For the following statements, choose the word or words inside the parentheses that serve(s) to make a correct statement. More than one answer may be correct. At 100oC, the equilibrium vapor pressure of water is 1 bar. Consider the process where 1 mol of water vapor at 1 bar of pressure is reversibly condensed to liquid water at 100oC by slowly removing heat ino the suroundings.

a) In this process, th entropy of the system will (increase, remain unchanged, decrease)

b) The entropy of the universe will (increase, remain unchanged, decrease)

c) Since he condensation process occurs at constant temperature and pressure, the accompanying free-energy change for the system will be (positive, zero, negative)

d) In practice, this process cannot be carried out reversibly. For the real process, compared with the ideal reversible one, different values will be observed for the (entropy change of the system, entropy change of the surroundings, entropy change of the universe, free-energy change of the system)

Explanation / Answer

a) H2O(g) -------> H2O(l)

In this process gaseous molecules are converted in to liwuid molecules, so entropy of gases is more than entropy of liquids. Hence entropy of the system will decrease.

b) Entropy of the universe will remain unchanged. Because temperature is constant entropy change of the system is equal to entropy change of the surroundings.

c) Delta G = delta H - T deltaS

It is an equilibrium process so free energy change for the system will be zero.

d) If the process can't be carried out reversibly, then the process is not at equilibrium. Hence different values will be observed for free energy change of the system.

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