Enthalpy Of Reaction And Calorimetry Worksheet Page 8
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20Hess’ Law with Given Equations Worksheet
1. a) Calculate the enthalpy change, ∆H rxn , for the following reaction using equations 1, 2 and 3.
3 N 2 H 4 (l)
+
4 ClF 3 (g)
3 N 2 (g)
+
12 HF (g)
+
2 Cl 2 (g)
H rxn (kJ)
Given:
1)
N 2 H 4
+
O 2
N 2
+
2 H 2 O
- 622
2) 2 ClF 3
+
2 NH 3
N 2
+
6 HF
+
Cl 2
- 1196
3) 4 NH 3
+
3 O 2
2 N 2
+
6 H 2 O
- 1530
b) Use the summation formula and the H rxn from (a) to determine the H f of ClF 3 .
c) Predict the sign of ∆Srxn and ∆Grxn.
2. Calculate the enthalpy change, H rxn , for the following reaction using equations 1, 2 and 3.
C(s, granite)
+
O 2 (g)
CO 2 (g)
H rxn (kJ)
Given:
1) 2 Sr
+
2 C
+
3 O 2
2 SrCO 3
- 2440
2)
SrO
+
CO 2
SrCO 3
- 234
3)
2 Sr
+
O 2
2 SrO
- 1184
3. Calculate the enthalpy change, H rxn , for the following reaction using the following equations:
2 B (s)
+
3 H 2 (g)
B 2 H 6 (g)
H rxn (kJ)
Given:
1) 2 B
+
3/2 O 2
B 2 O 3
- 1273.0
2)
B 2 H 6
+
3 O 2
B 2 O 3
+
3 H 2 O (g)
- 2035.0
3)
H 2
+
1/2 O 2
H 2 O (l)
- 285.8
4)
H 2 O (l)
H 2 O (g)
+ 44.0
4. a) Calculate the enthalpy change, H rxn , for the following reaction using equations 1, 2 and 3.
3 NO 2 (g) + H 2 O (l)
2 HNO 3 (aq)
+
NO (g)
H rxn (kJ)
Given:
1) 2 N 2
+
5 O 2
+
2 H 2 O
4 HNO 3
- 256
2)
2 NO
+
O 2
2 NO 2
- 116
3)
N 2
+
O 2
2 NO
+ 183
b) Use the summation formula to calculate the H rxn for (a)
c) Predict the sign of ∆Srxn and ∆Grxn.
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