Chapter 8 Chemical Equations Solutions To Review Questions Page 6
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9- Chapter 8 -
20. (a)
Two moles of Na react with one mole of Cl
to produce two moles of NaCl and release 822 kJ of
2
energy. The reaction is exothermic.
(b)
One mole of PCI
absorbs 92.9 kJ of energy to produce one mole of PC1
and one mole of Cl
.
5
3
2
The reaction is endothermic.
(c)
1 mol of solid sulfur will react with 2 moles of gaseous carbon monoxide to produce 1 mol of
gaseous sulfur dioxide, 2 moles of solid carbon, and 76 kilojoules of energy in this exothermic
reaction.
21. (a)
2 HgO s
182 kJ
2 Hg l
O
g
2
g
g
O l
(b)
2 H
O
2 H
571:6 kJ
2
2
2
22. (a)
Ca s
2 H
O l
Ca OH
aq
H
g
635:1 kJ
2
2
2
(b)
2 BrF
601:6 kJ
Br
3 F
3
2
2
D
23. (a)
s
2 AgCl s
g
decomposition reaction, 2 AgClO
3 O
3
2
single-displacement, Fe s
aq
g
aq
(b)
H
SO
H
FeSO
2
4
2
4
(c)
combination reaction, Zn s
Cl
g
ZnCl
s
2
2
double-displacement, HBr aq
KOH aq
KBr aq
O l
(d)
H
2
single-displacement, Ni s
aq
Pb s
aq
24. (a)
Pb NO
Ni NO
3 2
3 2
combination, MgO s
O l
s
(b)
H
Mg OH
2
2
(c)
decomposition, 2 HgO s
2 Hg l
O
g
2
aq
aq
s
Cl aq
(d)
double-displacement, PbCl
NH
CO
PbCO
2 NH
2
4 2
3
3
4
25. Combinations that form a precipitate:
Ca NO
aq
NH
SO
aq
CaSO
s
2 NH
NO
aq
3 2
4 2
4
4
4
3
aq
aq
s
aq
Ca NO
NH
CO
CaCO
2 NH
NO
3 2
4 2
3
3
4
3
aq
Cl aq
AgCl s
aq
AgNO
NH
NH
NO
3
4
4
3
aq
aq
s
aq
2 AgNO
NH
SO
Ag
SO
2 NH
NO
3
4 2
4
4
4
3
2
2 AgNO
aq
NH
CO
aq
Ag
CO
s
2 NH
NO
aq
3
4 2
3
3
4
3
2
26. P
O
12 HC1O
6 Cl
O
4 H
PO
4
10
4
2
7
3
4
10 O
12 4 O
6 7 O
4 4 O
10 O
48 O
42 O
16 O
58 O
58 O
27. In 5 Ni
(PO
)
there are:
3
4
2
(a)
15 atoms of N
(c)
40 atoms of O
(b)
10 atoms of P
(d)
65 total atoms
- 88 -
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