AP Chemistry -- Gibb's Free Energy Entropy Worksheet
1.    Phosgene, COCl2, was used as a war gas during World War I. It reacts with the moisture in the lungs to produce HCl, which causes the lungs to fill with fluid, leading to death of the victim. COCl2 has a standard entropy, So =284 J/mol K and Ho =-223 kJ/mol. Use this information and appropriate tables to calculate Go for COCl2(g) in kJ/mol at body temperature!

2. Aluminum oxidizes rather easily, but forms a thin protective coating of Al2O3 that prevents further oxidation of the aluminum beneath. Use the data for Hfo and So to calculate Go for Al2O3(s) in kJ/mol.

3. Calculate Go in kJ for the following reactions, using the appropriate data tables. 
      Use Go = Gproducts - Greactants

     (a) SO3(g) + H2O(l) ----> H2SO4(l) 

     (b) 2 NH4Cl(s) + CaO(s) ----> CaCl2(s) + H2O(l) + 2 NH3(g) 

     (c) CaSO4(s) + 2 HCl(g) ----> CaCl2(s) + H2SO4(l) 

     (d) C2H4(g) + H2O(l) ----> C2H5OH(l) 

     (e) Ca(s) + 2 H2SO4(l) ----> CaSO4(s) + SO2(g) + 2 H2O(l)

4. Calculate the Go in kJ for the following reactions at 100oC using the appropriate data tables. 

     (a) C2H4(g) + H2(g) ----> C2H6(g) 

     (b) 5 SO3(g) + 2 NH3(g) -----> 2 NO(g) + 5 SO2(g) + 3 H2O(g) 

      (c) N2O(g) + NO2(g) ----> 2 NO(g)