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Byju's Answer
Standard XII
Chemistry
Spontaneity
27.What is he...
Question
27.What is heat of Hydrogenation
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Q.
What is meant by the heat of hydrogenation?
Q.
Given the following standard heat of reactions :
(i) heat of formation of water =
−
68.3
k
c
a
l
(ii) heat of combustion of acetylene =
−
310.6
k
c
a
l
(iii) heat of combustion of ethylene =
−
337.2
k
c
a
l
Which of the following option(s) is / are correct for the hydrogenation of acetylene at constant volume
(
27
∘
C
)
?
Q.
Then heat of reaction
1
2
H
2
+
1
2
C
l
2
→
H
C
l
at
27
∘
C
is
−
22.1
k
c
a
l
. Calculate the heat of reaction at
77
∘
C
. The molar heat capacities at constant pressure at
27
∘
C
for hydrogen, chlorine and
H
C
l
are
6.82
,
7.70
and
6.80
c
a
l
m
o
l
−
1
respectively.
Q.
What is the order of increasing heat of hydrogenation for the following compounds (lowest first)?
Q.
The heat of hydrogenation of cyclohexene is 28.6 kcal and that of cyclohexadiene is about twice as much (i.e, 55.4kcal). What then would be the heat of hydrogenation of benzene, which has three double bonds?
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