Homework I:

(use MS EXCEL in all tasks, copy each task in separate spreadsheet and solve)

1.    Plot time dependency of A, B, and C for first-order reaction A à 2B+C. Integral equation for
A is C=C[0] exp(-kt) where C[0]=0.025 mol l^-1, k=0.125 min^-1.  Evaluate half-time and third-time
of the reaction.


2.    The half-time of tritium is 13.6years.

a)      Calculate a rate constant for decompositium of tritium. Assume a first-order reaction.

b)      How long will 99.99_ of the tritium disappear?

c)       Plot time dependency of both the tritium concentration and the rate of reaction.


3.    A first-order polymerization reaction is being run in a batch reactor. A concentration of
0.007 mol/liter of monomer is loaded into the reactor, and then a catalyst is added to initiate the
reaction. Experiments show that the reaction is 30% complete in 10 minutes.

a)      Calculate rate constant.

b)      Calculate half-time.

c)       How long will it také for the reaction to be 90% complete?

d)      How would the time in c) change if you increased the concentration in the reactor to 0.16
mol/liter?

e)      Plot concentration vs. time.

f)       Repeat it all for a second-order reaction.


4.    Reproduce the Example 3.A: „Fitting Data to Mono`s Law” using SM EXCEL.


The result (i.e. *.xls files send as *.zip file to teacher via E/mail or better: use Homework Vault
).