C dissolving potassium iodide in water d cooling

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c) dissolving potassium iodide in water d) cooling nitrogen gas from 80 o C to 20 o C J. Hilderbrandt, Chem. 12                  5
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e) N 2(g)   + 3H 2(g)   ----->  2NH 3(g) f) CaSO 4(s)   ------>  CaO (s)   +  SO 3(g) 2. From the standard entropy values given in the Appendix, calculate the standard entropy  change for the following reaction: CaCO 3(s)   ------>  CaO (s)   +  CO 2(g) 3. Iron metal can be produced by reducing iron(III) oxide with hydrogen: Fe 2 O 3(s)   +  3H 2(g)  ------> 2Fe (s)   +  3H 2 O (g)      H o  = 98.8 kJ;  S o  = 141.5 J/K  a) Show whether this reaction is spontaneous at 25 o C. b) If the reaction is not spontaneous at 25 o C, estimate the  temperature at which the reaction becomes spontaneous. 4. Calculate the standard free energy change for the oxidation of ammonia to give nitric oxide  (NO) and water from the standard free energy values given in the Appendix. 4NH 3(g)   +  5O 2(g)   ------>  4NO (g)   +  6H 2 O (l)   5. Using the following data at 25 o C 4Fe (s)  + 3O 2(g)   ----> 2Fe 2 O 3(s) G o  = -1487 kJ 2CO (g)  + O 2(g)   ----> 2CO 2(g) G o  = -514.4 kJ Calculate  G o  for the reaction Fe 2 O 3(s)  + 3CO (g)  ----> 2Fe (s)  + 3CO 2(g) 6. Bromine, Br 2(l)  is a liquid at room temperature. The normal boiling point is 310. K. Calculate the  entropy change in the system when 20.0 g of liquid bromine are vaporized. ( vaporization  =  + 31.0  kJ/mol) 7. The standard free energy change,  G o , for the reaction H 2(g)   +  I 2(g)      2HI (g) is 2.60 kJ at 25 o C. In one experiment, the initial pressures are P hydrogen   =  4.26 atm, P iodine  = 0.024  atm, and P HI  = 0.23 atm.  Calculate  G for the reaction at these pressures and predict the  direction of the reaction. 8. Find the value of the equilibrium constant, K, at 25 o C for the reaction 2NH 3(g)   +  CO 2(g)     NH 2 CONH 2(aq)   +  H 2 O (l) The standard free energy change,  G o , at 25 o C equals -13.6 kJ. 9. At 25 o C, K sp  for PbCrO 4  is 2.8 x 10 -13 .  Calculate the standard free energy change at 25 o C for  the reaction  PbCrO 4(aq)      Pb 2+ (aq)   +  CrO 4 2- (aq)          J. Hilderbrandt, Chem. 12                  6
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