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Byju's Answer
Standard VII
Chemistry
Gibb's Energy and Nernst Equation
For a cell Mg...
Question
For a cell
M
g
(
s
)
|
M
g
2
+
(
a
q
)
|
|
A
g
+
(
a
q
)
|
A
g
, find the maximum work (in kJ) that can be obtained by operating the cell.
E
o
(
M
g
2
+
/
M
g
)
=
−
2.37
V
,
E
o
(
A
g
+
/
A
g
)
=
0.8
V
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Solution
M
g
(
s
)
+
2
A
g
+
→
M
g
2
+
+
2
A
g
Given,
E
o
M
g
2
+
/
M
g
=
−
2.37
V
E
o
(
A
g
+
/
A
g
)
=
0.8
V
E
o
c
e
l
l
=
E
o
c
a
t
h
o
d
e
−
E
o
a
n
o
d
e
E
o
c
e
l
l
=
2.37
+
0.8
=
3.17
V
Again,
maximum work obtained
=
n
f
E
o
cell
=
2
×
96500
×
3.17
=
611810
J
=
611.81
k
J
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1
Similar questions
Q.
For the cell
M
g
(
s
)
|
M
g
2
+
(
a
q
)
|
|
A
g
+
(
a
q
)
|
A
g
(
s
)
, calculate the equilibrium constant at
25
o
C and the maximum work that can be obtained during operation of cell.
Given
E
o
M
g
/
M
g
2
+
=
+
2.37
V
and
E
o
A
g
+
/
A
g
=
0.80
V
Q.
For the cell reaction,
M
g
|
M
g
2
+
(
a
q
.
)
∥
A
g
+
(
a
q
.
)
|
A
g
calculate the equilibrium constant at
25
∘
C
and maximum work that can be obtained by operating the cell.
E
∘
M
g
2
+
/
M
g
=
−
2.37
v
o
l
t
and
E
∘
A
g
+
/
A
g
=
+
0.80
v
o
l
t
.
Q.
For a silver- magnesium voltaic cell,
calculate the maximum useful work that can be obtained by operating the cell.
M
g
2
+
+
2
e
−
→
M
g
(
s
)
;
E
0
=
−
2.37
V
A
g
+
(
a
q
)
+
e
−
→
A
g
(
s
)
;
E
0
=
+
0.80
V
Q.
For the cell
M
g
|
M
g
2
+
|
|
A
g
2
+
|
A
g
. Calculate the equilibrium constant at
25
∘
C
and the maximum work that can be obtained during the operation of the cell.
(Given:
E
∘
M
g
/
M
g
2
+
=
2.37
v
o
l
t
and
E
∘
A
g
2
+
/
A
g
=
0.80
v
o
l
t
).
Q.
What will be the effect on emf of cell when the concentration of
M
g
2
+
ion is decreased to
10
−
6
M
at
25
o
C
?
M
g
(
s
)
|
M
g
2
+
(
a
q
,
0.2
M
)
|
|
A
g
+
(
a
q
,
1
×
10
−
3
)
|
A
g
(
s
)
E
0
A
g
+
/
A
g
=
+
0.8
V
E
0
M
g
2
+
/
M
g
=
−
2.37
V
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