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Byju's Answer
Standard XII
Chemistry
Heat of Formation
S+3/2O_2⟶ SO_...
Question
S
+
3
2
O
2
⟶
S
O
3
+
2
x
k
c
a
l
;
S
O
2
+
1
2
O
2
⟶
S
O
3
+
y
k
c
a
l
;
The heat of formation of
S
O
2
is :
A
(
y
−
2
x
)
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B
(
2
x
+
y
)
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C
(
x
+
y
)
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D
2
x
/
y
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Solution
The correct option is
B
(
y
−
2
x
)
S
+
3
2
O
2
⟶
S
O
3
;
Δ
H
=
−
2
x
... ( i)
S
O
2
+
1
2
O
2
⟶
S
O
3
;
Δ
H
=
−
y
... (ii)
Subtract equation (ii) from equation (i)
S
+
O
2
⟶
S
O
2
;
Δ
H
=
(
y
−
2
x
)
.
Thus, the heat of formation of sulphur dioxide is
(y - 2x)
.
Suggest Corrections
0
Similar questions
Q.
In the reactions
S
+
3
2
O
2
→
S
O
3
+
2
x
k
c
a
l
and
S
O
2
+
1
2
O
2
→
S
O
3
+
y
k
c
a
l
, the heat of formation of
S
O
2
is :
Q.
Given that
S
+
3
2
O
2
→
S
O
3
+
2
x
kcal
and
S
O
2
+
1
2
O
2
→
S
O
3
+
y
kcal
then, the enthalpy of formation of
S
O
2
will be:
Q.
In the reaction
S
+
3
2
O
2
→
S
O
3
+
2
x
k
J
and
S
O
2
+
1
2
O
2
→
S
O
3
+
y
k
J
Heat of formation of
S
O
2
is
Q.
In the reaction : S + 3/2
O
2
→
S
O
3
+ 2x kcal and
S
O
2
+
1
/
2
O
2
→
S
O
3
+ y kcal, heat of formation of
S
O
2
is:
Q.
Given:
S
+
3
2
O
2
⟶
S
O
3
+
2
x
k
c
a
l
S
O
2
+
1
2
O
2
⟶
S
O
3
+
y
k
c
a
l
With the help of the above reactions, find out the heat of formation of
S
O
2
.
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