Cliffs AP Chemistry, 3rd Edition

(b) Restatement: Time for H 2 O 2 to go from 0.500 M to 0.150 M.

For first-order reactions:

log X.

Xkt

230

cm^0 =

t. log

k X

=^230 cmX^0

./

.

.

log.

0 015

230

0 150

0 500

min M

=ccmmM

./

..
0 015

(^230) 0 523
= min#
= 8.0 × 101 min
(c) Restatement: Calculate the half-life.
For first-order reactions:
.
./
t.
k
0 693
0 015
0 693 46
12 /==min=min
Part II: Specific Topics