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<big><font size="2"><big>The publisher's solution to 14.88 in the
11th edition is wrong. <br>
The problem gives information about how the half-life changes<br>
as the reaction proceeds for two different reactions. It then
asks<br>
what can you conclude about the rate laws of the two reactions<br>
(i.e. are the zero, first or second order).<br>
<br>
The solutions manual for the 11th edition erroneously states
the<br>
half-lifes for both reactions are constant over the course of
the<br>
reaction.<br>
<br>
This is incorrect. The only rate law for which the half-life
is constant<br>
and doesn't depend on conc. is first order. The half-life for
all other<br>
orders depends on conc. and thus changes as the reaction
proceeds.<br>
<br>
This is 14.102 in the 12th ed. and 14.96 in the 13th &
14th eds. The<br>
solution in the solutions manuals for these editions is
correct.<br>
<br>
Dr. Zellmer</big></font></big>
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