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Hermoine
Subject: Chemistry
, asked on 26/3/18
Please answer my questions
Answer
1
Hermoine
Subject: Chemistry
, asked on 25/3/18
Please explain all the four parts and with steps
Thanks in advance
Q19. One mole of ideal monoatomic gas is carried through the reversible cyclic process as shown in figure.
Calculate.
(A) Work done by the gas.
(B) The heat changed by the gas in path CA and AB.
(C) Net heat absorbed by the gas in the path BC.
(D) The maximum temperature attained by the gas during the cycle.
Answer
1
Hermoine
Subject: Chemistry
, asked on 25/3/18
a sample of a fluorocarbon gas was allowed to expand to twice its volume. In this reversible, adiabatic expansion, the temperature dropped from 298.15K to 248.44K. assuming the gas acts ideally during the expansion, estimate Cv for one mole
Answer
1
Erw Trjerth
Subject: Chemistry
, asked on 20/3/18
What is the sign convention to solve numericals in thermodynamics?
Answer
1
Erw Trjerth
Subject: Chemistry
, asked on 19/3/18
2.9g of a gas at 95
°
C occupies the same volume as 0.184 g of dihydrogen a 17
°
C at same pressure. What is the molar mass of the gas? (atom of H=1)
Answer
1
Archit Anand K.p.
Subject: Chemistry
, asked on 16/3/18
The average Xe-F bond energy is 34kcal/mol,first I.E of Xe is 279kcal/mol'electron affinity of F is 85kcal/mol &bond dissociation energy of F
2
is 38kcal/mpl. Then the enthalpy change for the reaction
XeF
4
------> Xe
+
+ F
-
+F
2
+F will be
Answer
2
Sudhanshu Singh
Subject: Chemistry
, asked on 16/3/18
Solve this
(
i
i
)
F
o
r
t
h
e
r
e
a
c
t
i
o
n
:
2
A
g
+
B
g
→
2
D
g
∆
U
°
=
-
10
.
5
k
J
a
n
d
∆
S
°
=
-
44
.
1
J
K
-
1
m
o
l
-
1
,
C
a
l
c
u
l
a
t
e
∆
G
°
f
o
r
t
h
e
r
e
a
c
t
i
o
n
a
n
d
p
r
e
d
i
c
t
w
h
e
t
h
e
r
t
h
e
r
e
a
c
t
i
o
n
m
a
y
o
c
c
u
r
s
p
o
n
tan
e
o
u
s
l
y
.
Answer
2
Sudhanshu Singh
Subject: Chemistry
, asked on 15/3/18
Q. Calculate the bond energy of C-H bond if
△
c
H
of CH
4
is -891 kJ/mol,
△
c
H
of C(s) is -394kJ/ mol,
△
c
H
of H
2
is -286kJ/mol. heat of sublimation of C(s) is 717kJ/mol; heat of dissociation of H
2
is 436 kJ/mol.
CH
4
(g) + 2O
2
(g)
→
CO
2
(g) + 2H
2
O (I)
△
H = -891 kJ/mol ______________ (i)
C(s) + O
2
(g)
→
CO
2
(g)
△
H = -394 kJ/mol ______________ (ii)
H
2
(g) + 1/2O
2
(g)
→
H
2
O (I)
△
H = -286 kJ/mol ______________ (iii)
C(s)
→
C(g)
△
H = 717 kJ/mol ______________ (iv)
H
2
(g)
→
2H (g)
△
H = 436 kJ/mol ______________ (v)
Answer
1
Vriddhi Kuls
Subject: Chemistry
, asked on 15/3/18
Q. For the reaction :
2A(g) +B(g)
→
2D(g)
∆
U
°
=
-
10
.
5
k
J
a
n
d
∆
S
°
=
-
44
.
1
J
K
-
1
m
o
l
-
1
.
Calculate
∆
G
°
for the reaction and predict whether the reaction may occur spontaneously.
Answer
1
Sudhanshu Singh
Subject: Chemistry
, asked on 14/3/18
Solve this:
3
.
F
o
r
t
h
e
r
e
a
c
t
i
o
n
:
2
C
l
(
g
)
→
C
l
2
(
g
)
,
w
h
a
t
a
r
e
t
h
e
s
i
g
n
s
∆
H
a
n
d
∆
S
?
Answer
1
Anisha Mishra
Subject: Chemistry
, asked on 14/3/18
Plz answer q. 12
Q.12. Derive the equation to show that
∆
G is negative for spontaneous reaction.
Answer
2
Anisha Mishra
Subject: Chemistry
, asked on 14/3/18
Plz answer q.9
9. Calculate the heat of the reaction
C
O
2
(
g
)
+
H
2
(
g
)
-
-
-
→
N
2
(
g
,
5
a
t
m
)
Given:
△
H
f
C
O
g
=
-
110
.
5
k
j
△
H
f
C
O
2
g
=
-
393
.
5
k
b
△
H
f
H
2
O
g
=
-
241
.
8
k
j
Answer
1
Himanshu Lal
Subject: Chemistry
, asked on 10/3/18
Question no 6,7,8,,9
Answer
1
Tanya
Subject: Chemistry
, asked on 9/3/18
O
n
t
h
e
b
a
s
i
s
o
f
t
h
e
f
o
l
l
o
w
i
n
g
t
h
e
r
m
o
c
h
e
m
i
c
a
l
d
a
t
a
[
∆
t
G
∘
(
H
+
,
a
q
)
=
0
]
H
2
O
(
l
)
→
H
+
(
aq
)
+
OH
-
(
aq
)
;
∆
H
=
57
.
32
kJ
H
2
(
g
)
+
1
2
O
2
(
g
)
→
H
2
O
(
l
)
;
∆
H
=
286
.
20
kJ
calculate
the
value
of
enthalpy
of
formation
of
OH
-
ion
at
25
∘
C
.
Answer
1
Khushi Rastogi
Subject: Chemistry
, asked on 5/3/18
Plz solve ques 24 and 25
Q 24 Calculate
∆
G on dissolving 1 mol. NaCl at 25
o
C. lattic enthalpy = 777.8 ,
hydration enthalpy = - 774 KJ mol
-1
of NaCl,
∆
S at 25
o
C = 0.043 KJ/mol K
Q 25 For 2NO(g) + O
2
→
2 NO
2
the
∆
H and
∆
S are -113.00KJ/Mol and - 145 JK
-1
mol
-1
respective. Find the temp. at which this reaction is spontaneous
Answer
1
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Thanks in advance
Q19. One mole of ideal monoatomic gas is carried through the reversible cyclic process as shown in figure.
Calculate.
(A) Work done by the gas.
(B) The heat changed by the gas in path CA and AB.
(C) Net heat absorbed by the gas in the path BC.
(D) The maximum temperature attained by the gas during the cycle.
XeF4------> Xe+ + F-+F2+F will be
CH4 (g) + 2O2 (g) CO2 (g) + 2H2O (I) H = -891 kJ/mol ______________ (i)
C(s) + O2 (g) CO2 (g) H = -394 kJ/mol ______________ (ii)
H2 (g) + 1/2O2 (g) H2O (I) H = -286 kJ/mol ______________ (iii)
C(s) C(g) H = 717 kJ/mol ______________ (iv)
H2 (g) 2H (g) H = 436 kJ/mol ______________ (v)
Q. For the reaction :
2A(g) +B(g) 2D(g)
Calculate for the reaction and predict whether the reaction may occur spontaneously.
Q.12. Derive the equation to show that G is negative for spontaneous reaction.
9. Calculate the heat of the reaction
Given:
Q 24 Calculate G on dissolving 1 mol. NaCl at 25o C. lattic enthalpy = 777.8 ,
hydration enthalpy = - 774 KJ mol-1 of NaCl, S at 25o C = 0.043 KJ/mol K
Q 25 For 2NO(g) + O2 2 NO2 the H and S are -113.00KJ/Mol and - 145 JK-1mol-1 respective. Find the temp. at which this reaction is spontaneous