CHM 1046                      QUIZ  9                 November 8, 1996


     This quiz is take-home and open book, and it is intended that
all members of the group contribute to completing it.  Only one
copy is to be submitted by the group, and all members who
participated should sign their names below.  Quiz is due by noon on
Tuesday, November 12.  Place it in the box in room 208 HTL.

                   List names in alphabetical order!

_______________________  _______________________

_______________________  _______________________

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Points


     1.    The decomposition of hydrogen peroxide to water and oxygen
           follows a first order rate law in H2O2 with a half-life of
           18 min.

           2 H2O2(l)  ----->   H2O(l)  +   O2(g)

(2)  (a)   What is the rate constant k for the reaction?







(2)  (b)   Starting with a solution that is 0.500 M in hydrogen peroxide,
           what will be the hydrogen peroxide concentration after 60 min?








(5)  2.    Indicate in the blank whether the following processes involve
           an increase or a decrease in entropy:

     ________   H2O(g) ---> H2O(l).

     ________   mixing 1 mole of N2 with 1 mole of O2.

     ________   heating water from 25oC to 60oC.

     ________   CaCO3(s)  --->  CaO(s)  +  O2(g)

     ________   CO2(g)  --->  CO2(aq)



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

                N2O4(g)  þ    2 NO2(g)

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









(2)        (b)  Calculate þGo at 25oC  for this reaction from the þGof
                data given in appendix C, and compare it to þGo
                calculated from þHo and þSo above.











(3)        (c)  Calculate Kp at 25oC for this reaction from the þGo 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).










(3)        (d)  Calculate þGo for the reaction at 100oC.