Enthalpy Of Reaction And Calorimetry Worksheet Page 13
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20KINETICS – Rate laws
1.
Using the data provided below, draw a Born-Haber cycle for the formation of lithium fluoride and
calculate the enthalpy of formation of the compound
1 /
Li (s)
+
2 F 2 (g)
LiF (s)
Given: H vap (Li metal) = 155 kJ/mol
BE of F-F = 150 kJ/mol
st
1
IE of Li atom = 520 kJ/mol
E.A. of F atom = 333 kJ/mol
Lattice energy = 1012 kJ/mol
2.
Draw a Bohr-Haber cycle for the following reaction:
1 /
H 2 O (l)
H 2 (g)
+
2 O 2 (g)
Given: BE for H-H = 431. kJ/mol
BE for O=O = 485. kJ/mol
H vap for water = 40.65 kJ/mol
BE for H-O = 458.9 kJ/mol
3.
For the reaction:
2 NO (g)
+
H 2 (g)
N 2 O (g)
+
H 2 O (g)
the following data was obtained:
Trial
[NO] i (mol / L)
[H 2 ] i (mol / L)
Initial Rate (mol / Ls)
1
0.150
0.800
0.500
2
0.0750
0.800
0.125
3
0.150
0.400
0.250
a) What is the rate law for the reaction?
b) What is the value of the rate constant?
c) What is the rate when the [NO] is 0.300 mol/L and [H
] is 0.400 mol/L?
2
4.
For the reaction:
O 3 (g)
+
NO (g)
O 2 (g)
+
NO 2 (g)
the following data was obtained:
[O 3 ] i (mol /
[NO] i (mol / L)
Trial
Initial Rate of Formation of NO 2 (mol / Ls)
L)
1
0.0010
0.0010
X
2
0.0010
0.0020
2x
3
0.0020
0.0010
2x
4
0.0020
0.0020
4x
What is the rate law for the reaction?
5.
Write the following for the reaction
N 2
+
3H 2
2NH 3
a) The rate expression for the reaction (assume this reaction is elementary, only occurs in 1 step.)
b) The order of the reaction for each reactant
c) The overall order of the reaction
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