Quiz Grade _________         Quiz 4     Name ____________________
July 17, 1996               CHM 1046                             
                                   Soc.Sec.Num.__________________

     This quiz is take-home and open book.  The completed quiz is
due at the beginning of class on Friday, July 19.  

Points

1.   Following is a reaction you studied in Chapter 15.

          N2O4(g)  þ    2 NO2(g)

(3)  (a)  Calculate delta Ho, and delta So at 25oC for this
          reaction from the data given in Appendix C.  (Be sure to
          give units)









(3)  (b)  Calculate delta Go at 25oC  for this reaction from the
          delta Gof data given in appendix C, and compare it to
          delta Go calculated from delta Ho and delta So above.











(3)  (c)  Calculate Kp at 25oC for this reaction from the delta Go
          found in (b) above.  (Note:  Since the standard state of
          gases are taken as 1 atm pressure, the equilibrium
          constant calculated this way would be Kp rather than Kc).










(1)  (d)  From Le Chatelier's principle, how would you expect the
          equilibrium to shift (right or left) as the temperature
          is increased?
          
          
          
          
          
(3)  (e)  Calculate delta Go for the reaction at 100oC.











(3)  (f)  Calculate Kp for the reaction at 100oC.












(1)  (g)  From Le Chatelier's principle, how would you expect the
          equilibrium to shift (right or left) if the concentration
          of both N2O4 and NO2 were doubled?







(3)  (h)  Delta Go as calculated in part (b) represents the free
          energy change when both N2O4 and NO2 are at their
          standard states of 1 atmosphere pressure and 25oC. 
          Calculate delta G for the reaction when the pressure of
          each gas is 2 atm.