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Question
Chemistry
Which of the following reactions corresponds to the definition of enthalpy of formation ?
Q. Which of the following reactions corresponds to the definition of enthalpy of formation ?
2309
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A
C
X
(
g
)
+
O
X
2
X
(
g
)
CO
X
2
X
(
g
)
B
C
X
(
s
)
+
O
X
2
X
(
l
)
CO
X
2
X
(
g
)
C
C
X
(
s
)
+
O
X
2
X
(
g
)
CO
X
2
X
(
g
)
D
C
X
(
l
)
+
O
X
2
X
(
s
)
CO
X
2
X
(
g
)
Solution:
Enthalpy of formation is the heat change when
1
mole of a substance is formed from its constituent elements in gaseous state