Environmental Engineering Reference
In-Depth Information
5.2
Using one of the relations Equations (5.8
5.11), find the time in which the con-
centration of a reactant is reduced by 50%.
-
5.3
For a second-order reaction, calculate the time needed to halve the initial con-
centration of the reactants. Which conclusion can you draw comparing this
result with the one of the previous exercise?
5.4
Find the relation between k
f
and V for RX. 5.19.
5.5
Find the relation between
K
p
and
K
c
for the following gas-phase reac-
tion:
a
A+
b
B
!
c
C+
d
D
5.6
Qualitatively plot
K
c
versus the temperature for an endothermic and an exother-
mic reaction.
5.7
In a container with a volumetric capacity of 1 L, we leave 0.05 mol of PCl
5
and
5 mol of PCl
3
reacting at 760 K. At equilibrium, we have 0.043 mol of Cl
2
. Find
K
c
for the reaction PCl
5
!
PCl
3
+Cl
2
.
5.8
A container with a capacity of 1 L holds 3 mol of N
2
O
4
at 343 K. At this tem-
perature, the dissociation grade is 65%. Find
K
p
for the reaction N
2
O
4
!
2NO
2
.
At 450
C, the equilibrium constant for the reaction 2HI
!
5.9
H
2
+I
2
is
K
p
= 50.
Find the dissociation grade of HI.
G
0
at 865
C for the following reaction:
5.10
Find the value of
Δ
ðÞ
!
CaCO
3
s
CaO s
ðÞ
+CO
2
g
ðÞ
knowing that at that temperature the partial pressure of CO
2
is 1333 mmHg. Is
this a spontaneous reaction?
PROJECTS
P5.1
In a chemical lab, determine the decomposition rate of hydrogen peroxide with
a homogeneous KI catalyst
.
The decomposition of the hydrogen peroxide with I
-
takes place following the
reaction equation:
2H
2
O
2
l
ðÞ!
2H
2
Ol
ðÞ
+O
2
g
ðÞ
The catalyst makes the reaction follow these two steps:
H
2
O
2
+I
−
!
IO
−
+H
2
O
a
:
IO
−
+H
2
O
2
!
I
−
+O
2
+H
2
O
b
:
Track the decrease in weight of the beaker solution due to the formation of gas-
eous oxygen.
Search WWH ::
Custom Search