if you have 5 moles of conjugate acid, 2 moles of base, and 2 moles of acid. What is the dissociation constant for his reaction and the temperature is 30 degree celcius?

To determine the dissociation constant for this reaction at a specific temperature, you need additional information such as the reaction equation or the equilibrium constant expression. Without this information, it is not possible to provide a specific answer.

However, if you have the necessary information, you can use the equilibrium constant expression to find the dissociation constant. The general form of the equilibrium constant expression for an acid-base reaction is:

Kc = [Conjugate Base]^[base] / [Conjugate Acid]^[acid]

Where:
[Conjugate Base] is the concentration of the conjugate base
[base] is the concentration of the base
[Conjugate Acid] is the concentration of the conjugate acid
[acid] is the concentration of the acid

To use this equation, you need the concentrations of the species involved in the reaction. Make sure the concentrations are in the same units (usually moles per liter or Molarity, denoted as M).

Please provide the equation or the equilibrium constant expression for the reaction you mentioned, along with the concentrations in order for me to assist you further in calculating the dissociation constant.