Enthalpy Of Reaction And Calorimetry Worksheet Page 9
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205. Calculate the enthalpy change, H rxn , for the following reaction using the following equations:
P 4 O 10 (s)
+
6 PCl 5 (g)
10 Cl 3 PO (g)
H rxn (kJ)
Given:
1)
P 4
+
6 Cl 2
4 PCl 3
- 1225.6
2)
P 4
+
5 O 2
P 4 O 10
- 2967.3
3)
PCl 3
+
Cl 2
PCl 5
- 84.2
4)
PCl 3
+
1/2 O 2
Cl 3 PO
- 285.7
6. Calculate the enthalpy change, H rxn , for the following reaction using the following equations:
2 Al (s)
+
3 Cl 2 (g)
2 AlCl 3 (s)
H rxn (kJ)
Given:
6 HCl (aq)
1) 2 Al
+
2 AlCl 3 (aq) + 3 H 2
- 1049.0
2)
HCl (g)
HCl (aq)
- 74.8
3)
H 2
+
Cl 2
2 HCl (g)
- 185.0
AlCl 3 (s)
4)
AlCl 3 (aq)
- 323.0
7. Calculate the enthalpy change, H rxn , for the formation of HNO 2 using the following equations:
H rxn (kJ)
Given:
1)
NH 3 +
HNO 2
NH 4 NO 2
- 37.7
2)
2 NH 3
N 2
+
3 H 2
+ 169.9
3)
N 2
+
2 H 2 O
NH 4 NO 2
+ 320.7
4)
2 H 2 O
2 H 2
+
O 2
+ 571.6
8. Acetylene, C 2 H 2 , is a gas commonly used in welding. It is formed in the reaction of calcium carbide,
CaC 2 , with water. Given the thermochemical equations below, calculate the value of ΔH f ° for acetylene
in units of kilojoules per mole:
H rxn (kJ)
Given:
1)
CaO
+
H 2 O
Ca(OH) 2
- 65.3
2) 2 CaO
5 C
2 CaC 2
+
CO 2
+ 753.0
3)
+
CaCO 3
CaO
+
CO 2
+ 178.0
4)
CaC 2
2 H 2 O
Ca(OH) 2 +
C 2 H 2
- 126.0
5)
C
+
O 2
CO 2
- 393.5
6)
2 H 2 O
2 H 2
+
O 2
+ 571.6
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