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3. Second Law of Thermodynamics a. Give an example of a reversible and an irreversible process giving a reason for each choice. (2 points) 1 b. The standard entropy change for the vaporization of ethane is AS = 79.9 J/K at its normal boiling point of 89.0°C. What is the enthalpy of vaporization of ehane? (4 points)

c. During an exothermic reaction, does the entropy of the surroundings increase or decrease? Explain your reasoning. (2 points) I d. For each of the following changes, state if the change in entropy is positive, negative or zero. In each case give a reason for your answer. (4 points) i. Decomposition of calcium carbonate to calcium oxide and carbon dioxide

d. For each of the following changes, state if the change in entropy is pc negative or zero. In each case give a reason for your answer. (4 points) i. Decomposition of calcium carbonate to calcium oxide and carbon di ii. Complete combustion of carbon Evaporation of water iv. llendonner Crystallization of quartz