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Chemistry
Chemistry
Problem
If
Δ
f
H
∘
\Delta_f H^\circ
Δ
f
H
∘
of
C
2
H
4
(
g
)
C_2H_4(g)
C
2
H
4
(
g
)
and
Δ
f
H
∘
\Delta_f H^\circ
Δ
f
H
∘
of
C
2
H
6
(
g
)
C_2H_6(g)
C
2
H
6
(
g
)
are
q
1
q_1
q
1
and
q
2
q_2
q
2
kcal
m
o
l
−
1
mol^{-1}
m
o
l
−
1
, then heat of hydrogenation of
C
2
H
4
(
g
)
C_2H_4(g)
C
2
H
4
(
g
)
is: a.
q
2
−
q
1
q_2 - q_1
q
2
−
q
1
b.
q
2
+
q
1
q_2 + q_1
q
2
+
q
1
c.
q
1
+
2
q
2
q_1 + 2q_2
q
1
+
2
q
2
d.
q
1
−
q
2
q_1 - q_2
q
1
−
q
2
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