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JEE Main Chemistry Class 11 Chemical Thermodynamics Part 1 Questions
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Question : 85
Total: 100
The standard enthalpy of formation
(
∆
f
H
∘
)
at
298
K
for methane,
C
H
4
(
g
)
is
−
74.8
k
J
m
o
l
−
1
. The additional information required to determine the average energy for C
−
H bond formation would be
[2006]
the first four ionization energies of carbon and electron gain enthalpy of hydrogen
the dissociation energy of hydrogen molecule,
H
2
the dissociation energy of
H
2
and enthalpy of sublimation of carbon
latent heat of vapourization of methane
Validate
Solution:
The standard enthalpy of formation of
C
H
4
is given by the equation:
C
(
s
)
+
2
H
2
(
g
)
⟶
C
H
4
(
g
)
Hence, dissociation energy of hydrogen and enthalpy of sublimation of carbon is required.
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