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Byju's Answer
Standard XII
Chemistry
Laws of Mass Conservation
The work done...
Question
The work done in an open vessel at
300
K
, when 112 g iron reacts with
H
C
l
to give
F
e
C
l
2
, is nearly:
A
−
1.2
k
c
a
l
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B
0.6
k
c
a
l
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C
−
0.3
k
c
a
l
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D
−
0.2
k
c
a
l
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Solution
The correct option is
C
−
1.2
k
c
a
l
Solution:-
Molar mass of
F
e
=
56
g
Given mass of
F
e
=
112
g
As we know that,
No. of moles
=
Mass
Molar mass
Therefore, number of moles of
F
e
used-
n
=
112
56
=
2
moles
As we know that,
w
=
−
P
Δ
V
=
−
n
R
T
[
∵
P
V
=
n
R
T
]
Given
T
=
300
K
∴
w
=
−
2
×
2
×
300
=
−
1200
cal
=
−
1.2
k
c
a
l
Hence the work done will be
−
1.2
kcal
.
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