Question

4. Predict the sign of the entropy change for the following processes.

a. Ag+(aq) + Cl? (aq) ? AgCl (s)

b. 2 Mg (s) + O2 (g) ? 2 MgO (s)

c. 4 NH3 (g) + 5 O2 (g) ? 4 NO (g) + 6 H2O (l)

d. 3 NO2 (g) + H2O (l) ? 2 HNO3 (aq) + NO (g)

5. Calculate ?S298 ° for the following changes.

(a) SnCl4(l) ? SnCl4(g)

(b) CS2(g) ? CS2(l)

6. Calculate ?S298 ° for the following changes.

(a) CaO (s) + H2O (l) ? Ca(OH)2 (s)

(b) Fe2O3 (s) + 3 CO (g) ? 2 Fe (s) + 3 CO2 (g)

(c) CS2 (g) + 3 Cl2 (g) ? CCl4 (g) + S2Cl2 (g)

(d) 2 Al (s) + Fe2O3 (s) ? Al2O3 (s) + 2 Fe (s)