Obtaining One Equilibrium Concentration Given the others

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Obtaining One Equilibrium Concentration Given the
others
A 1.0-L vessel contains an unknown amount of PCl5
and 0.020 mol each of PCl3 and Cl2 equilibrium at
250 oC. How many moles of PCl5 are in the vessel
if Kc for this reaction is 0.0415 at 250 oC.
147
Obtaining Equilibrium Concentrations For All
Species
Kc 54.1 at 430 oC
H2(g) I2(g)
2HI(g) Initial (M) 0.500 0.500
0.000 Change(M) -x -x
2x
Equilibrium(M) (0.500 -x) (0.500 -x) 2x
(2x)2
Kc

54.1
(0.500 - x)(0.500 - x)
148
Obtaining Equilibrium Concentrations For All
Species
2x
7.37
(0.500 - x)
x 0.393 M
At equilibrium, the concentrations are
H2 (0.500 - 0.393) M 0.107 M
I2 (0.500 - 0.393) M 0.107 M
HI 2 x 0.393 M 0.786 M
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