Write the expression for the equilibrium constants for the following reactions.
a) PCl5 (g) ⇋ PCl3 (g) + Cl2 (g)
b) H2 (g) + I2 (g) ⇋ 2 HI (g)
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a) PCl
5
⇌
x
PCl
3
+
x
Cl
2
⇒
0.16−x
x
2
=5.8×10
−2
x=0.071 M
[PCl
3
]=[Cl
2
]=0.071 M,[PCl
5
]=0.089 M
b) (I)H
2(g)
+I
2(g)
⇌2HI
(g)
K
C
=
[H
2
][I
2
]
[HI]
2
(II)4NH
3(g)
+SO
2(g)
⇌4NO
(g)
+6H
2
O
(g)
K
C
=
[NH
3
]
4
[O
2
]
5
[NO]
4
[H
2
O]
6
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