2a. A mixture initially contains A , B , and C in the following concentrations:

Question

2a. A mixture initially contains A, B, and C in the following concentrations: [A] = 0.650M , [B] = 0.950M , and [C] = 0.700M . The following reaction occurs and equilibrium is established:

A+2B?C

At equilibrium, [A] = 0.550M  and [C] = 0.800M . Calculate the value of the equilibrium constant, Kc.

3.

Based on a Kc value of  0.210 and the initial concentrations given in the table, determine in which direction the net reaction will proceed to attain equilibrium.

label reverse , forward  for each mixture

Initial concentrations (M) Mixture [XY] [X] [Y] A 0.100 0 0 B 0.500 0.100 0.100 C 0.200 0.300 0.300

Explanation / Answer

2) since .100m of A decrease will lead to increase of [C] by 0.100m

according to the reaction

subsequent [B] consumed will be 0.200M

final conc of [b] will be 0.750m

Kc=[C]/[A][B]^2=0.800/(0.550)(.750^2)=2.58 =Kc

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