Enthalpy Of Reaction And Calorimetry Worksheet Page 14
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206.
The rate constant for the reaction
HNO 3
+
NH 3
NH 4 NO 3
is 14.5 L/(mol.sec). If the concentration of the nitric acid is 0.050 M and the concentration of the
ammonia is 0.10 M, what will the rate of this elementary reaction be?
6 H + (aq)
7.
For the reaction:
5 Br¯ (aq)
+
BrO 3 ¯ (aq)
+
3 Br 2 (l)
+
3
H 2 O (l)
the following data was obtained at 298 K:
[H + ] i (mol/L)
Trial
Initial Rate of Disappearance
[Br¯] i (mol/L)
[BrO 3 ¯] i (mol /L)
of BrO 3 ¯(mol/Ls)
1
0.00100
0.00500
0.100
2.50 x 10 -4
5.00 x 10 –4
2
0.00200
0.00500
0.100
3.75 x 10 –4
3
0.00100
0.00750
0.100
3.00 x 10 –3
4
0.00100
0.01500
0.200
a) Determine the order of the reaction for each reactant.
b) Write the rate law for the overall reaction.
c) Determine the value of the specific rate constant for the reaction at 298 K.
8.
When two compounds, A and B, are mixed together, they form the compound C, by a reaction that is not
well understood. Fortunately, the following rate information was experimentally determined, as shown
below:
A (mol/L)
B (mol/L)
Rate (mol/(L sec))
0.050
0.050
4.0 x 10 -3
0.100
0.050
8.0 x 10 -3
0.050
0.100
1.6 x 10 -2
a)
Determine the rate expression for this reaction.
b) Determine the rate constant for this reaction with units.
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