Equilibrium Tut 1

Please note that in all the reactions, the phase is aq or g unless indicated otherwise, such as s or l.

1. The following reaction is in equilibrium:


The reaction had started at volume 10dm3 and temperature T with only 5 mols of A and 12 mols of B. It was found that the mols of A at equilibrium was 1 mol.
1.1. What is understood by the two way arrow?
1.2. Calculate the value of the equilibrium constant at T.
1.1. The reaction is reversible.
1.2.

2. Study the following reaction which is in equilibrium.


Initially there were 2 mols A, and 3,2 mols of B. No C was present. When equilibrium was established, the concentration of A was found to be 0,4M. The volume was 2dm3.
Calculate the value of the equilibrium constant.

3. The following reaction is in equilibrium.


The reaction started with 0,8 mols of A and 3,6 mols of B. Included at the start was 1 mol of C as well.
When equilibrium was established, the mols of A found then was 0,2.
Calculate the equilibrium constant if the volume was 10dm3.
The substance A is solid and hence cannot have a concentration. It is also excluded from the Kc expression.

4. The following reaction is called the Haber Process.


The reaction was started with 2,7 mols of N2 and 7,8 mols of H2. At equilibrium, the concentration of ammonia was found to be 0,4mol.dm-3. Calculate the equilibrium constant if the volume was 6dm3.







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