Here is why this set of equilibrium amounts for A, BC, AB and C is unreasonable.

Guess

A

BC

BC

C

Reasonable (Y/N)

1

3.0

2.0

2.0

3.0

(Yes/No)

In this guess the Change (the amounts reacting and forming) can be determined for A, BC, AB and C by comparing the equilibrium amount of each species to the initial amount.

For A: [A]equilibrium - [A]initial = 3.0 - 4.0 = -1.0 (Since the equilibrium amount is less than the initial amount we include a '-' to indicate is A reacting.)

For BC: [BC]equilibrium - [BC]initial = 2.0 - 2.6 = -0.6 (Since the equilibrium amount is less than the initial amount we include a '-' to indicate is BC reacting.)

For AB: [AB]equilibrium - [AB]initial = 2.0 - 1.0 = +1.0 (Since the equilibrium amount is higher than the initial amount we include a '+' to indicate is AB forming.)

For C: [C]equilibrium - [C]initial = 2.0 - 2.0 = +1.0 (Since the equilibrium amount is higher than the initial amount we include a '+' to indicate is C forming.)

Experiment #7

[A]

[BC]

[BC]

[C]

Initial

4.0

2.6

1.0

2.0

Change

-1.0

-0.6

+1.0

+1.0

Equilibrium

3.0

2.0

2.0

3.0

The Change does NOT follows the stoichiometry of the balanced chemical equation;

A(g) + BC(g) ---> AB(g) + C(g)

The stoichiometry in the chemical equation must be the same as the stoichiometry of the Change row: 1 A : 1 BC : 1AB : 1 C. In this case it is not.

It is not possible for less BC to react compared to A. The amount of BC reacting must equal the amount of A reacting.

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