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Byju's Answer
Standard XII
Chemistry
Limiting Reagent or Reactant
H 2 + Cl 2 → ...
Question
H
2
+
C
l
2
→
2
H
C
l
If
2.02
g
of
H
2
and
35.45
g
of
C
l
2
are allowed to react, what is the limiting reactant and what mass of
H
C
l
will be formed?
A
H
2
,
72.92
g
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B
C
l
2
,
36.46
g
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C
H
2
,
36.46
g
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D
C
l
2
,
18.23
g
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Solution
The correct option is
B
C
l
2
,
36.46
g
H
2
+
C
l
2
→
2
H
C
l
No. of moles of Hydrogen
=
2.02
2.02
=
1
m
o
l
e
No. of moles of Oxygen
=
35.45
70.9
=
0.5
m
o
l
e
1
m
o
l
e
of
H
2
react with
1
m
o
l
e
of Chlorine to give
2
m
o
l
e
s
of HCl. But Chlorine has only
0.5
m
o
l
e
. So only
1
m
o
l
e
of HCl is formed.
⇒
Mass of
1
m
o
l
e
of HCl
=
1.01
+
35.45
=
36.469
As, chlorine is completely consumed,
C
l
2
is limiting reagent.
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Similar questions
Q.
Formation of
H
C
l
is given by the equation
H
2
+
C
l
2
=
2
H
C
l
. The concentration of
H
2
,
C
l
2
and
H
C
l
are
1
M
,
2
M
and
3
M
respectively. Find the equilibrium constant.
Q.
If
S
o
for
H
2
,
C
l
2
and
H
C
l
are
0.13
,
0.22
and
0.19
k
J
K
−
1
m
o
l
−
1
respectively. The total change in standard entropy for the reaction
H
2
+
C
l
2
→
2
H
C
l
is:
Q.
If
S
o
for
H
2
,
C
l
2
and HCl are 0.13, 0.22 and 0.19 KJ
K
−
1
m
o
l
−
1
respectively. The total change is standard entropy for the reaction,
H
2
+
C
l
2
→
2
H
C
l
is:
Q.
Analyse the following equation and answer the questions.
H
2
+
C
l
2
→
2
H
C
l
What is the mass of chlorine required to react completely with 2g hydrogen?
Q.
H
2
+
C
l
2
→
2
H
C
l
+
44
K
.
C
a
l
. Heat of decomposition of
H
C
l
is:
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