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Question

Determine the value of the equilibrium constant for the reaction.
A+B2C
if 1.0 mol of A, 1.4 mol of Band 0.50 mol of C are placed in a 1.0-L vessel and allowed come to equilibrium. The final concentration of C is 0.75 mol/L.

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Solution

A+B2C
t=0 1 1.4 0
t=t 1x 1.4x 2x
given at equilibrium,
2x=0.5 mol
x=0.25 mol
at, t=t 0.75 1.15 0.5
So,
K=(0.5)2(0.75)(1.15)
K=0.289
Now, 2x=0.75 mol
x=0.375 mol
So, K=(0.75)2(10.375)(1.40.375)=0.878
The final concentration of C is 0.878.

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