Calculating Equilibrium Concentrations
AP Chemistry · Flashcards
AP CHEMISTRY · FLASHCARDS
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QUESTION
State the effect of adding a reactant on the equilibrium position.
QUESTION
Calculate
K
c
K_c
K
c
for
H
2
+
I
2
⇌
2
H
I
H_2 + I_2 \rightleftharpoons 2HI
H
2
+
I
2
⇌
2
H
I
with
[
H
2
]
=
1
M
[H_2] = 1M
[
H
2
]
=
1
M
,
[
I
2
]
=
1
M
[I_2] = 1M
[
I
2
]
=
1
M
,
[
H
I
]
=
2
M
[HI] = 2M
[
H
I
]
=
2
M
.
QUESTION
For the reaction
C
H
4
(
g
)
+
2
O
2
(
g
)
⇌
C
O
2
(
g
)
+
2
H
2
O
(
g
)
CH_4(g) + 2O_2(g) \rightleftharpoons CO_2(g) + 2H_2O(g)
C
H
4
(
g
)
+
2
O
2
(
g
)
⇌
C
O
2
(
g
)
+
2
H
2
O
(
g
)
, write the
K
c
K_c
K
c
expression.
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ANSWER
K
c
=
[
C
O
2
]
[
H
2
O
]
2
[
C
H
4
]
[
O
2
]
2
K_c = \frac{[CO_2][H_2O]^2}{[CH_4][O_2]^2}
K
c
=
[
C
H
4
]
[
O
2
]
2
[
C
O
2
]
[
H
2
O
]
2
. Products over reactants, each raised to their stoichiometric coefficients.
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