Cliffs AP Chemistry, 3rd Edition

29.(D)

Step 1: Write the balanced equation in equilibrium:

2 SO 3 (g) ↔2 SO 2 (g) + O 2 (g)

Step 2: Write the equilibrium expression:

SO

SO O

Kc 2

3

22 2

=

6

66

@

@@

Step 3: Create a chart showing initial and final concentrations.

Species Initial Concentration Final Concentration

SO 3 1.20 M 1.20 M −0.20 M = 1.00 M

SO 2 0 M 0.20 M

O 2 0 M 0.10 M

Step 4: Substitute the final equilibrium concentrations into the equilibrium expression.

.

..

.

SO

SO O

K

100

020 010

c 22 40 10

2

3

3

22 2

= ==# -

^

^^

h

hh

6

66

@

@@

30.(A) Remember, log [H+] = −pH, so [H+] = 10–pH.

31. (D) When ∆G°= 0,

∆S ...

...

T ∆H

0 0700 0 2000 0 10000

600 400 1170

==

++

-+--

%

%

^^

^^

hh

hh

8 6

8 6

B @

@B

= 1.00 × 10^3 Κ

32.(B)
...
k t yr yr
0 693
6930

0 693 100 10 1

12

== =# -^4 -

33.(E) The functional group of a salt is

The name of this compound is potassium propionate.

34.(C) The functional group of a ketone is

The name of this ketone is methyl ethyl ketone.

C

O

M = metal

C

O

O−.. .M+

Answers and Explanations for the Practice Test