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T-13
Answer ___________________________
3.
a)
Using the natural log form of the Arrhenius equation, calculate the value of “A”, the
frequency factor, for the uncatalyzed reaction at room temperature. (0.5 marks)
b)
Assuming that the value of A is the same for both the catalyzed and uncatalyzed reactions,
calculate the activation energy for the catalyzed reaction at room temperature using the
value for “A” determined in 3(a). (0.7 marks)
c)
Draw a diagram of the potential energy versus reaction coordinate (progress) similar to the
one in Figure 1 for the reaction studied in this experiment:
2 I
-
+ S2O
8
2-
I2 + 2 SO
4
2-
H
rxn
= -322 kJ/mol
Clearly label the activation energy and the enthalpy change for both the uncatalyzed and
catalyzed reactions. Draw E
a
&
H
rxn
approximately to scale. (0.5 marks)
