How to calculate equilibrium constant from two reactions?

The equilibrium constant is defined as the ratio of the reaction products to the reaction reactants. It is equivalent to the ratio of the forward reaction rate to the backward reaction rate. If a reaction is spontaneous, the equilibrium constant value will be greater than 1. If the reaction is not spontaneous, the value of the equilibrium constant will be less than 1. The absolute value of the equilibrium constant measures how much energy is required to drive a reaction towards the products.

How to calculate equilibrium constant from two reactions with one of them equilibrium?

If you have two different chemical reactions which happen at the same time at the same place and at the same temperature and pressure, then the reaction that reaches equilibrium first is the one with the lower equilibrium constant. The other reaction will happen too fast to reach equilibrium. If you want to calculate the equilibrium constant of one reaction based on another reaction, then you need to know the total reaction volume and the relative amounts of the products in both reactions. Here are two examples:

How to calculate equilibrium constant from two reactions with all of them equilibrium?

Let’s take an example to demonstrate this procedure. Consider in a reaction A and B: A → B (forward reaction). If the forward reaction is much faster than the backward reaction, the system will be in a state of equilibrium. In other words, the reaction will reach a state in which the production of B is exactly balanced by its consumption. Similarly, in another reaction B → A, the system will also be at a state of equilibrium. The two reactions will run in a constant

How to calculate equilibrium constant from two reactions with two of them equilibrium?

If you have two reactions, each of which has two equilibrium states, you can use the law of conservation of mass to determine the equilibrium constant of each reaction.

How to calculate equilibrium constant of two

Herein, the equilibrium constant of two reactions is presented as Kc = Q2/Q1, where Q1 refers to the reaction with the lower reaction quotient (or reaction activity), while Q2 refers to the reaction with the higher. For example, consider two reactions R1 and R2, where reaction R1 is a reaction with a lower reaction quotient and reaction R2 is a reaction with a higher reaction quotient. The reaction quotient of reaction R1 is represented by