Decrease in entropy of the system

Question

Assignment:

Question 1. Given the following table of thermodynamic data,
substance    ΔH_f°    S°

POCl₃ (g)    -542.2 kJ/mol    325 J/mol ^{- K}
POCl₃ (l)    -597.0    222

determine the normal boiling point (in °C) of POCl₃.

a. 133.0
b. 532
c. 273.3
d. 259
e. 308.3

Question 2. Which one of the following reactions would have a positive value for ΔS°?

a. Ba(OH)₂(s) + CO₂(g) → BaCO₃(s) + H₂O(l)
b. N₂(g) + 3H₂(g) → 2NH₃(g)
c. AgNO₃(aq) + HCl(aq) → AgCl(s) + HNO₃(aq)
d. 2SO₃(g) → 2SO₂(g) + O₂(g)
e. freezing water to form ice

Question 3. Which one of the following processes results in a decrease of the entropy of the system?

a. dissolving oxygen in water
b. explosion of nitroglycerine
c. sublimation of naphthalene
d. boiling of alcohol
e. dissolving sodium chloride in water

Question 4. Which one of the following processes results in a decrease of the entropy of the system?

a. dissolving oxygen in water
b. explosion of nitroglycerine
c. sublimation of naphthalene
d. boiling of alcohol
e. dissolving sodium chloride in water